| 1 | |
| 2 | |
| 3 | * Digital Audio (PCM) abstract layer
|
| 4 | * Copyright (c) by Jaroslav Kysela <[email protected]>
|
| 5 | * Abramo Bagnara <[email protected]>
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| 6 |
|
| 7 |
|
| 8 | #include <linux/slab.h>
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| 9 | #include <linux/sched/signal.h>
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| 10 | #include <linux/time.h>
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| 11 | #include <linux/math64.h>
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| 12 | #include <linux/export.h>
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| 13 | #include <sound/core.h>
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| 14 | #include <sound/control.h>
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| 15 | #include <sound/tlv.h>
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| 16 | #include <sound/info.h>
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| 17 | #include <sound/pcm.h>
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| 18 | #include <sound/pcm_params.h>
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| 19 | #include <sound/timer.h>
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| 20 |
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| 21 | #include "pcm_local.h"
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| 22 |
|
| 23 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG
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| 24 | #define CREATE_TRACE_POINTS
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| 25 | #include "pcm_trace.h"
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| 26 | #else
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| 27 | #define trace_hwptr(substream, pos, in_interrupt)
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| 28 | #define trace_xrun(substream)
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| 29 | #define trace_hw_ptr_error(substream, reason)
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| 30 | #define trace_applptr(substream, prev, curr)
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| 31 | #endif
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| 32 |
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| 33 | static int fill_silence_frames(struct snd_pcm_substream *substream,
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| 34 | snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
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| 35 |
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| 36 |
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| 37 | static inline void update_silence_vars(struct snd_pcm_runtime *runtime,
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| 38 | snd_pcm_uframes_t ptr,
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| 39 | snd_pcm_uframes_t new_ptr)
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| 40 | {
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| 41 | snd_pcm_sframes_t delta;
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| 42 |
|
| 43 | delta = new_ptr - ptr;
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| 44 | if (delta == 0)
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| 45 | return;
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| 46 | if (delta < 0)
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| 47 | delta += runtime->boundary;
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| 48 | if ((snd_pcm_uframes_t)delta < runtime->silence_filled)
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| 49 | runtime->silence_filled -= delta;
|
| 50 | else
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| 51 | runtime->silence_filled = 0;
|
| 52 | runtime->silence_start = new_ptr;
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| 53 | }
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| 54 |
|
| 55 | |
| 56 | * fill ring buffer with silence
|
| 57 | * runtime->silence_start: starting pointer to silence area
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| 58 | * runtime->silence_filled: size filled with silence
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| 59 | * runtime->silence_threshold: threshold from application
|
| 60 | * runtime->silence_size: maximal size from application
|
| 61 | *
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| 62 | * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
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| 63 |
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| 64 | void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
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| 65 | {
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| 66 | struct snd_pcm_runtime *runtime = substream->runtime;
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| 67 | snd_pcm_uframes_t frames, ofs, transfer;
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| 68 | int err;
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| 69 |
|
| 70 | if (runtime->silence_size < runtime->boundary) {
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| 71 | snd_pcm_sframes_t noise_dist;
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| 72 | snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
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| 73 | update_silence_vars(runtime, runtime->silence_start, appl_ptr);
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| 74 |
|
| 75 | if (new_hw_ptr == ULONG_MAX)
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| 76 | new_hw_ptr = runtime->status->hw_ptr;
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| 77 |
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| 78 | noise_dist = appl_ptr - new_hw_ptr;
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| 79 | if (noise_dist < 0)
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| 80 | noise_dist += runtime->boundary;
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| 81 |
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| 82 | noise_dist += runtime->silence_filled;
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| 83 | if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
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| 84 | return;
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| 85 | frames = runtime->silence_threshold - noise_dist;
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| 86 | if (frames > runtime->silence_size)
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| 87 | frames = runtime->silence_size;
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| 88 | } else {
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| 89 | |
| 90 | * This filling mode aims at free-running mode (used for example by dmix),
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| 91 | * which doesn't update the application pointer.
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| 92 |
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| 93 | snd_pcm_uframes_t hw_ptr = runtime->status->hw_ptr;
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| 94 | if (new_hw_ptr == ULONG_MAX) {
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| 95 | |
| 96 | * Initialization, fill the whole unused buffer with silence.
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| 97 | *
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| 98 | * Usually, this is entered while stopped, before data is queued,
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| 99 | * so both pointers are expected to be zero.
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| 100 |
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| 101 | snd_pcm_sframes_t avail = runtime->control->appl_ptr - hw_ptr;
|
| 102 | if (avail < 0)
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| 103 | avail += runtime->boundary;
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| 104 | |
| 105 | * In free-running mode, appl_ptr will be zero even while running,
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| 106 | * so we end up with a huge number. There is no useful way to
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| 107 | * handle this, so we just clear the whole buffer.
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| 108 |
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| 109 | runtime->silence_filled = avail > runtime->buffer_size ? 0 : avail;
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| 110 | runtime->silence_start = hw_ptr;
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| 111 | } else {
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| 112 |
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| 113 | update_silence_vars(runtime, hw_ptr, new_hw_ptr);
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| 114 | }
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| 115 | |
| 116 | * In this mode, silence_filled actually includes the valid
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| 117 | * sample data from the user.
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| 118 |
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| 119 | frames = runtime->buffer_size - runtime->silence_filled;
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| 120 | }
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| 121 | if (snd_BUG_ON(frames > runtime->buffer_size))
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| 122 | return;
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| 123 | if (frames == 0)
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| 124 | return;
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| 125 | ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
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| 126 | do {
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| 127 | transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
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| 128 | err = fill_silence_frames(substream, ofs, transfer);
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| 129 | snd_BUG_ON(err < 0);
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| 130 | runtime->silence_filled += transfer;
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| 131 | frames -= transfer;
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| 132 | ofs = 0;
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| 133 | } while (frames > 0);
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| 134 | snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
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| 135 | }
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| 136 |
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| 137 | #ifdef CONFIG_SND_DEBUG
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| 138 | void snd_pcm_debug_name(struct snd_pcm_substream *substream,
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| 139 | char *name, size_t len)
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| 140 | {
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| 141 | snprintf(name, len, "pcmC%dD%d%c:%d",
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| 142 | substream->pcm->card->number,
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| 143 | substream->pcm->device,
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| 144 | substream->stream ? 'c' : 'p',
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| 145 | substream->number);
|
| 146 | }
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| 147 | EXPORT_SYMBOL(snd_pcm_debug_name);
|
| 148 | #endif
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| 149 |
|
| 150 | #define XRUN_DEBUG_BASIC (1<<0)
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| 151 | #define XRUN_DEBUG_STACK (1<<1)
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| 152 | #define XRUN_DEBUG_JIFFIESCHECK (1<<2)
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| 153 |
|
| 154 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG
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| 155 |
|
| 156 | #define xrun_debug(substream, mask) \
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| 157 | ((substream)->pstr->xrun_debug & (mask))
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| 158 | #else
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| 159 | #define xrun_debug(substream, mask) 0
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| 160 | #endif
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| 161 |
|
| 162 | #define dump_stack_on_xrun(substream) do { \
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| 163 | if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
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| 164 | dump_stack(); \
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| 165 | } while (0)
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| 166 |
|
| 167 |
|
| 168 | void __snd_pcm_xrun(struct snd_pcm_substream *substream)
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| 169 | {
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| 170 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 171 |
|
| 172 | trace_xrun(substream);
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| 173 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
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| 174 | struct timespec64 tstamp;
|
| 175 |
|
| 176 | snd_pcm_gettime(runtime, &tstamp);
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| 177 | runtime->status->tstamp.tv_sec = tstamp.tv_sec;
|
| 178 | runtime->status->tstamp.tv_nsec = tstamp.tv_nsec;
|
| 179 | }
|
| 180 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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| 181 | if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
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| 182 | char name[16];
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| 183 | snd_pcm_debug_name(substream, name, sizeof(name));
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| 184 | pcm_warn(substream->pcm, "XRUN: %s\n", name);
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| 185 | dump_stack_on_xrun(substream);
|
| 186 | }
|
| 187 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG
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| 188 | substream->xrun_counter++;
|
| 189 | #endif
|
| 190 | }
|
| 191 |
|
| 192 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG
|
| 193 | #define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
|
| 194 | do { \
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| 195 | trace_hw_ptr_error(substream, reason); \
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| 196 | if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
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| 197 | pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
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| 198 | (in_interrupt) ? 'Q' : 'P', ##args); \
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| 199 | dump_stack_on_xrun(substream); \
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| 200 | } \
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| 201 | } while (0)
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| 202 |
|
| 203 | #else
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| 204 |
|
| 205 | #define hw_ptr_error(substream, fmt, args...) do { } while (0)
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| 206 |
|
| 207 | #endif
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| 208 |
|
| 209 | int snd_pcm_update_state(struct snd_pcm_substream *substream,
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| 210 | struct snd_pcm_runtime *runtime)
|
| 211 | {
|
| 212 | snd_pcm_uframes_t avail;
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| 213 |
|
| 214 | avail = snd_pcm_avail(substream);
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| 215 | if (avail > runtime->avail_max)
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| 216 | runtime->avail_max = avail;
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| 217 | if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
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| 218 | if (avail >= runtime->buffer_size) {
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| 219 | snd_pcm_drain_done(substream);
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| 220 | return -EPIPE;
|
| 221 | }
|
| 222 | } else {
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| 223 | if (avail >= runtime->stop_threshold) {
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| 224 | __snd_pcm_xrun(substream);
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| 225 | return -EPIPE;
|
| 226 | }
|
| 227 | }
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| 228 | if (runtime->twake) {
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| 229 | if (avail >= runtime->twake)
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| 230 | wake_up(&runtime->tsleep);
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| 231 | } else if (avail >= runtime->control->avail_min)
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| 232 | wake_up(&runtime->sleep);
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| 233 | return 0;
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| 234 | }
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| 235 |
|
| 236 | static void update_audio_tstamp(struct snd_pcm_substream *substream,
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| 237 | struct timespec64 *curr_tstamp,
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| 238 | struct timespec64 *audio_tstamp)
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| 239 | {
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| 240 | struct snd_pcm_runtime *runtime = substream->runtime;
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| 241 | u64 audio_frames, audio_nsecs;
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| 242 | struct timespec64 driver_tstamp;
|
| 243 |
|
| 244 | if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
|
| 245 | return;
|
| 246 |
|
| 247 | if (!(substream->ops->get_time_info) ||
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| 248 | (runtime->audio_tstamp_report.actual_type ==
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| 249 | SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
|
| 250 |
|
| 251 | |
| 252 | * provide audio timestamp derived from pointer position
|
| 253 | * add delay only if requested
|
| 254 |
|
| 255 |
|
| 256 | audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
|
| 257 |
|
| 258 | if (runtime->audio_tstamp_config.report_delay) {
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| 259 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
| 260 | audio_frames -= runtime->delay;
|
| 261 | else
|
| 262 | audio_frames += runtime->delay;
|
| 263 | }
|
| 264 | audio_nsecs = div_u64(audio_frames * 1000000000LL,
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| 265 | runtime->rate);
|
| 266 | *audio_tstamp = ns_to_timespec64(audio_nsecs);
|
| 267 | }
|
| 268 |
|
| 269 | if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec ||
|
| 270 | runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) {
|
| 271 | runtime->status->audio_tstamp.tv_sec = audio_tstamp->tv_sec;
|
| 272 | runtime->status->audio_tstamp.tv_nsec = audio_tstamp->tv_nsec;
|
| 273 | runtime->status->tstamp.tv_sec = curr_tstamp->tv_sec;
|
| 274 | runtime->status->tstamp.tv_nsec = curr_tstamp->tv_nsec;
|
| 275 | }
|
| 276 |
|
| 277 |
|
| 278 | |
| 279 | * re-take a driver timestamp to let apps detect if the reference tstamp
|
| 280 | * read by low-level hardware was provided with a delay
|
| 281 |
|
| 282 | snd_pcm_gettime(substream->runtime, &driver_tstamp);
|
| 283 | runtime->driver_tstamp = driver_tstamp;
|
| 284 | }
|
| 285 |
|
| 286 | static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
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| 287 | unsigned int in_interrupt)
|
| 288 | {
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| 289 | struct snd_pcm_runtime *runtime = substream->runtime;
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| 290 | snd_pcm_uframes_t pos;
|
| 291 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
|
| 292 | snd_pcm_sframes_t hdelta, delta;
|
| 293 | unsigned long jdelta;
|
| 294 | unsigned long curr_jiffies;
|
| 295 | struct timespec64 curr_tstamp;
|
| 296 | struct timespec64 audio_tstamp;
|
| 297 | int crossed_boundary = 0;
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| 298 |
|
| 299 | old_hw_ptr = runtime->status->hw_ptr;
|
| 300 |
|
| 301 | |
| 302 | * group pointer, time and jiffies reads to allow for more
|
| 303 | * accurate correlations/corrections.
|
| 304 | * The values are stored at the end of this routine after
|
| 305 | * corrections for hw_ptr position
|
| 306 |
|
| 307 | pos = substream->ops->pointer(substream);
|
| 308 | curr_jiffies = jiffies;
|
| 309 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
|
| 310 | if ((substream->ops->get_time_info) &&
|
| 311 | (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
|
| 312 | substream->ops->get_time_info(substream, &curr_tstamp,
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| 313 | &audio_tstamp,
|
| 314 | &runtime->audio_tstamp_config,
|
| 315 | &runtime->audio_tstamp_report);
|
| 316 |
|
| 317 |
|
| 318 | if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
|
| 319 | snd_pcm_gettime(runtime, &curr_tstamp);
|
| 320 | } else
|
| 321 | snd_pcm_gettime(runtime, &curr_tstamp);
|
| 322 | }
|
| 323 |
|
| 324 | if (pos == SNDRV_PCM_POS_XRUN) {
|
| 325 | __snd_pcm_xrun(substream);
|
| 326 | return -EPIPE;
|
| 327 | }
|
| 328 | if (pos >= runtime->buffer_size) {
|
| 329 | if (printk_ratelimit()) {
|
| 330 | char name[16];
|
| 331 | snd_pcm_debug_name(substream, name, sizeof(name));
|
| 332 | pcm_err(substream->pcm,
|
| 333 | "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
|
| 334 | name, pos, runtime->buffer_size,
|
| 335 | runtime->period_size);
|
| 336 | }
|
| 337 | pos = 0;
|
| 338 | }
|
| 339 | pos -= pos % runtime->min_align;
|
| 340 | trace_hwptr(substream, pos, in_interrupt);
|
| 341 | hw_base = runtime->hw_ptr_base;
|
| 342 | new_hw_ptr = hw_base + pos;
|
| 343 | if (in_interrupt) {
|
| 344 |
|
| 345 |
|
| 346 | delta = runtime->hw_ptr_interrupt + runtime->period_size;
|
| 347 | if (delta > new_hw_ptr) {
|
| 348 |
|
| 349 | hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
|
| 350 | if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
|
| 351 | hw_base += runtime->buffer_size;
|
| 352 | if (hw_base >= runtime->boundary) {
|
| 353 | hw_base = 0;
|
| 354 | crossed_boundary++;
|
| 355 | }
|
| 356 | new_hw_ptr = hw_base + pos;
|
| 357 | goto __delta;
|
| 358 | }
|
| 359 | }
|
| 360 | }
|
| 361 |
|
| 362 |
|
| 363 | if (new_hw_ptr < old_hw_ptr) {
|
| 364 | hw_base += runtime->buffer_size;
|
| 365 | if (hw_base >= runtime->boundary) {
|
| 366 | hw_base = 0;
|
| 367 | crossed_boundary++;
|
| 368 | }
|
| 369 | new_hw_ptr = hw_base + pos;
|
| 370 | }
|
| 371 | __delta:
|
| 372 | delta = new_hw_ptr - old_hw_ptr;
|
| 373 | if (delta < 0)
|
| 374 | delta += runtime->boundary;
|
| 375 |
|
| 376 | if (runtime->no_period_wakeup) {
|
| 377 | snd_pcm_sframes_t xrun_threshold;
|
| 378 | |
| 379 | * Without regular period interrupts, we have to check
|
| 380 | * the elapsed time to detect xruns.
|
| 381 |
|
| 382 | jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
|
| 383 | if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
|
| 384 | goto no_delta_check;
|
| 385 | hdelta = jdelta - delta * HZ / runtime->rate;
|
| 386 | xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
|
| 387 | while (hdelta > xrun_threshold) {
|
| 388 | delta += runtime->buffer_size;
|
| 389 | hw_base += runtime->buffer_size;
|
| 390 | if (hw_base >= runtime->boundary) {
|
| 391 | hw_base = 0;
|
| 392 | crossed_boundary++;
|
| 393 | }
|
| 394 | new_hw_ptr = hw_base + pos;
|
| 395 | hdelta -= runtime->hw_ptr_buffer_jiffies;
|
| 396 | }
|
| 397 | goto no_delta_check;
|
| 398 | }
|
| 399 |
|
| 400 |
|
| 401 | if (delta >= runtime->buffer_size + runtime->period_size) {
|
| 402 | hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
|
| 403 | "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
|
| 404 | substream->stream, (long)pos,
|
| 405 | (long)new_hw_ptr, (long)old_hw_ptr);
|
| 406 | return 0;
|
| 407 | }
|
| 408 |
|
| 409 |
|
| 410 | if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
|
| 411 | goto no_jiffies_check;
|
| 412 |
|
| 413 | |
| 414 | * Such hardware usually just increases the position at each IRQ,
|
| 415 | * thus it can't give any strange position.
|
| 416 |
|
| 417 | if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
|
| 418 | goto no_jiffies_check;
|
| 419 | hdelta = delta;
|
| 420 | if (hdelta < runtime->delay)
|
| 421 | goto no_jiffies_check;
|
| 422 | hdelta -= runtime->delay;
|
| 423 | jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
|
| 424 | if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
|
| 425 | delta = jdelta /
|
| 426 | (((runtime->period_size * HZ) / runtime->rate)
|
| 427 | + HZ/100);
|
| 428 |
|
| 429 | new_hw_ptr = old_hw_ptr;
|
| 430 | hw_base = delta;
|
| 431 |
|
| 432 |
|
| 433 | while (delta > 0) {
|
| 434 | new_hw_ptr += runtime->period_size;
|
| 435 | if (new_hw_ptr >= runtime->boundary) {
|
| 436 | new_hw_ptr -= runtime->boundary;
|
| 437 | crossed_boundary--;
|
| 438 | }
|
| 439 | delta--;
|
| 440 | }
|
| 441 |
|
| 442 | hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
|
| 443 | "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
|
| 444 | (long)pos, (long)hdelta,
|
| 445 | (long)runtime->period_size, jdelta,
|
| 446 | ((hdelta * HZ) / runtime->rate), hw_base,
|
| 447 | (unsigned long)old_hw_ptr,
|
| 448 | (unsigned long)new_hw_ptr);
|
| 449 |
|
| 450 | delta = 0;
|
| 451 | hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
|
| 452 | }
|
| 453 | no_jiffies_check:
|
| 454 | if (delta > runtime->period_size + runtime->period_size / 2) {
|
| 455 | hw_ptr_error(substream, in_interrupt,
|
| 456 | "Lost interrupts?",
|
| 457 | "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
|
| 458 | substream->stream, (long)delta,
|
| 459 | (long)new_hw_ptr,
|
| 460 | (long)old_hw_ptr);
|
| 461 | }
|
| 462 |
|
| 463 | no_delta_check:
|
| 464 | if (runtime->status->hw_ptr == new_hw_ptr) {
|
| 465 | runtime->hw_ptr_jiffies = curr_jiffies;
|
| 466 | update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
|
| 467 | return 0;
|
| 468 | }
|
| 469 |
|
| 470 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
|
| 471 | runtime->silence_size > 0)
|
| 472 | snd_pcm_playback_silence(substream, new_hw_ptr);
|
| 473 |
|
| 474 | if (in_interrupt) {
|
| 475 | delta = new_hw_ptr - runtime->hw_ptr_interrupt;
|
| 476 | if (delta < 0)
|
| 477 | delta += runtime->boundary;
|
| 478 | delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
|
| 479 | runtime->hw_ptr_interrupt += delta;
|
| 480 | if (runtime->hw_ptr_interrupt >= runtime->boundary)
|
| 481 | runtime->hw_ptr_interrupt -= runtime->boundary;
|
| 482 | }
|
| 483 | runtime->hw_ptr_base = hw_base;
|
| 484 | runtime->status->hw_ptr = new_hw_ptr;
|
| 485 | runtime->hw_ptr_jiffies = curr_jiffies;
|
| 486 | if (crossed_boundary) {
|
| 487 | snd_BUG_ON(crossed_boundary != 1);
|
| 488 | runtime->hw_ptr_wrap += runtime->boundary;
|
| 489 | }
|
| 490 |
|
| 491 | update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
|
| 492 |
|
| 493 | return snd_pcm_update_state(substream, runtime);
|
| 494 | }
|
| 495 |
|
| 496 |
|
| 497 | int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
|
| 498 | {
|
| 499 | return snd_pcm_update_hw_ptr0(substream, 0);
|
| 500 | }
|
| 501 |
|
| 502 | |
| 503 | * snd_pcm_set_ops - set the PCM operators
|
| 504 | * @pcm: the pcm instance
|
| 505 | * @direction: stream direction, SNDRV_PCM_STREAM_XXX
|
| 506 | * @ops: the operator table
|
| 507 | *
|
| 508 | * Sets the given PCM operators to the pcm instance.
|
| 509 |
|
| 510 | void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
|
| 511 | const struct snd_pcm_ops *ops)
|
| 512 | {
|
| 513 | struct snd_pcm_str *stream = &pcm->streams[direction];
|
| 514 | struct snd_pcm_substream *substream;
|
| 515 |
|
| 516 | for (substream = stream->substream; substream != NULL; substream = substream->next)
|
| 517 | substream->ops = ops;
|
| 518 | }
|
| 519 | EXPORT_SYMBOL(snd_pcm_set_ops);
|
| 520 |
|
| 521 | |
| 522 | * snd_pcm_set_sync_per_card - set the PCM sync id with card number
|
| 523 | * @substream: the pcm substream
|
| 524 | * @params: modified hardware parameters
|
| 525 | * @id: identifier (max 12 bytes)
|
| 526 | * @len: identifier length (max 12 bytes)
|
| 527 | *
|
| 528 | * Sets the PCM sync identifier for the card with zero padding.
|
| 529 | *
|
| 530 | * User space or any user should use this 16-byte identifier for a comparison only
|
| 531 | * to check if two IDs are similar or different. Special case is the identifier
|
| 532 | * containing only zeros. Interpretation for this combination is - empty (not set).
|
| 533 | * The contents of the identifier should not be interpreted in any other way.
|
| 534 | *
|
| 535 | * The synchronization ID must be unique per clock source (usually one sound card,
|
| 536 | * but multiple soundcard may use one PCM word clock source which means that they
|
| 537 | * are fully synchronized).
|
| 538 | *
|
| 539 | * This routine composes this ID using card number in first four bytes and
|
| 540 | * 12-byte additional ID. When other ID composition is used (e.g. for multiple
|
| 541 | * sound cards), make sure that the composition does not clash with this
|
| 542 | * composition scheme.
|
| 543 |
|
| 544 | void snd_pcm_set_sync_per_card(struct snd_pcm_substream *substream,
|
| 545 | struct snd_pcm_hw_params *params,
|
| 546 | const unsigned char *id, unsigned int len)
|
| 547 | {
|
| 548 | *(__le32 *)params->sync = cpu_to_le32(substream->pcm->card->number);
|
| 549 | len = min(12, len);
|
| 550 | memcpy(params->sync + 4, id, len);
|
| 551 | memset(params->sync + 4 + len, 0, 12 - len);
|
| 552 | }
|
| 553 | EXPORT_SYMBOL_GPL(snd_pcm_set_sync_per_card);
|
| 554 |
|
| 555 | |
| 556 | * Standard ioctl routine
|
| 557 |
|
| 558 |
|
| 559 | static inline unsigned int div32(unsigned int a, unsigned int b,
|
| 560 | unsigned int *r)
|
| 561 | {
|
| 562 | if (b == 0) {
|
| 563 | *r = 0;
|
| 564 | return UINT_MAX;
|
| 565 | }
|
| 566 | *r = a % b;
|
| 567 | return a / b;
|
| 568 | }
|
| 569 |
|
| 570 | static inline unsigned int div_down(unsigned int a, unsigned int b)
|
| 571 | {
|
| 572 | if (b == 0)
|
| 573 | return UINT_MAX;
|
| 574 | return a / b;
|
| 575 | }
|
| 576 |
|
| 577 | static inline unsigned int div_up(unsigned int a, unsigned int b)
|
| 578 | {
|
| 579 | unsigned int r;
|
| 580 | unsigned int q;
|
| 581 | if (b == 0)
|
| 582 | return UINT_MAX;
|
| 583 | q = div32(a, b, &r);
|
| 584 | if (r)
|
| 585 | ++q;
|
| 586 | return q;
|
| 587 | }
|
| 588 |
|
| 589 | static inline unsigned int mul(unsigned int a, unsigned int b)
|
| 590 | {
|
| 591 | if (a == 0)
|
| 592 | return 0;
|
| 593 | if (div_down(UINT_MAX, a) < b)
|
| 594 | return UINT_MAX;
|
| 595 | return a * b;
|
| 596 | }
|
| 597 |
|
| 598 | static inline unsigned int muldiv32(unsigned int a, unsigned int b,
|
| 599 | unsigned int c, unsigned int *r)
|
| 600 | {
|
| 601 | u_int64_t n = (u_int64_t) a * b;
|
| 602 | if (c == 0) {
|
| 603 | *r = 0;
|
| 604 | return UINT_MAX;
|
| 605 | }
|
| 606 | n = div_u64_rem(n, c, r);
|
| 607 | if (n >= UINT_MAX) {
|
| 608 | *r = 0;
|
| 609 | return UINT_MAX;
|
| 610 | }
|
| 611 | return n;
|
| 612 | }
|
| 613 |
|
| 614 | |
| 615 | * snd_interval_refine - refine the interval value of configurator
|
| 616 | * @i: the interval value to refine
|
| 617 | * @v: the interval value to refer to
|
| 618 | *
|
| 619 | * Refines the interval value with the reference value.
|
| 620 | * The interval is changed to the range satisfying both intervals.
|
| 621 | * The interval status (min, max, integer, etc.) are evaluated.
|
| 622 | *
|
| 623 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 624 | * negative error code.
|
| 625 |
|
| 626 | int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
|
| 627 | {
|
| 628 | int changed = 0;
|
| 629 | if (snd_BUG_ON(snd_interval_empty(i)))
|
| 630 | return -EINVAL;
|
| 631 | if (i->min < v->min) {
|
| 632 | i->min = v->min;
|
| 633 | i->openmin = v->openmin;
|
| 634 | changed = 1;
|
| 635 | } else if (i->min == v->min && !i->openmin && v->openmin) {
|
| 636 | i->openmin = 1;
|
| 637 | changed = 1;
|
| 638 | }
|
| 639 | if (i->max > v->max) {
|
| 640 | i->max = v->max;
|
| 641 | i->openmax = v->openmax;
|
| 642 | changed = 1;
|
| 643 | } else if (i->max == v->max && !i->openmax && v->openmax) {
|
| 644 | i->openmax = 1;
|
| 645 | changed = 1;
|
| 646 | }
|
| 647 | if (!i->integer && v->integer) {
|
| 648 | i->integer = 1;
|
| 649 | changed = 1;
|
| 650 | }
|
| 651 | if (i->integer) {
|
| 652 | if (i->openmin) {
|
| 653 | i->min++;
|
| 654 | i->openmin = 0;
|
| 655 | }
|
| 656 | if (i->openmax) {
|
| 657 | i->max--;
|
| 658 | i->openmax = 0;
|
| 659 | }
|
| 660 | } else if (!i->openmin && !i->openmax && i->min == i->max)
|
| 661 | i->integer = 1;
|
| 662 | if (snd_interval_checkempty(i)) {
|
| 663 | snd_interval_none(i);
|
| 664 | return -EINVAL;
|
| 665 | }
|
| 666 | return changed;
|
| 667 | }
|
| 668 | EXPORT_SYMBOL(snd_interval_refine);
|
| 669 |
|
| 670 | static int snd_interval_refine_first(struct snd_interval *i)
|
| 671 | {
|
| 672 | const unsigned int last_max = i->max;
|
| 673 |
|
| 674 | if (snd_BUG_ON(snd_interval_empty(i)))
|
| 675 | return -EINVAL;
|
| 676 | if (snd_interval_single(i))
|
| 677 | return 0;
|
| 678 | i->max = i->min;
|
| 679 | if (i->openmin)
|
| 680 | i->max++;
|
| 681 |
|
| 682 | i->openmax = (i->openmax && i->max >= last_max);
|
| 683 | return 1;
|
| 684 | }
|
| 685 |
|
| 686 | static int snd_interval_refine_last(struct snd_interval *i)
|
| 687 | {
|
| 688 | const unsigned int last_min = i->min;
|
| 689 |
|
| 690 | if (snd_BUG_ON(snd_interval_empty(i)))
|
| 691 | return -EINVAL;
|
| 692 | if (snd_interval_single(i))
|
| 693 | return 0;
|
| 694 | i->min = i->max;
|
| 695 | if (i->openmax)
|
| 696 | i->min--;
|
| 697 |
|
| 698 | i->openmin = (i->openmin && i->min <= last_min);
|
| 699 | return 1;
|
| 700 | }
|
| 701 |
|
| 702 | void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
|
| 703 | {
|
| 704 | if (a->empty || b->empty) {
|
| 705 | snd_interval_none(c);
|
| 706 | return;
|
| 707 | }
|
| 708 | c->empty = 0;
|
| 709 | c->min = mul(a->min, b->min);
|
| 710 | c->openmin = (a->openmin || b->openmin);
|
| 711 | c->max = mul(a->max, b->max);
|
| 712 | c->openmax = (a->openmax || b->openmax);
|
| 713 | c->integer = (a->integer && b->integer);
|
| 714 | }
|
| 715 |
|
| 716 | |
| 717 | * snd_interval_div - refine the interval value with division
|
| 718 | * @a: dividend
|
| 719 | * @b: divisor
|
| 720 | * @c: quotient
|
| 721 | *
|
| 722 | * c = a / b
|
| 723 | *
|
| 724 | * Returns non-zero if the value is changed, zero if not changed.
|
| 725 |
|
| 726 | void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
|
| 727 | {
|
| 728 | unsigned int r;
|
| 729 | if (a->empty || b->empty) {
|
| 730 | snd_interval_none(c);
|
| 731 | return;
|
| 732 | }
|
| 733 | c->empty = 0;
|
| 734 | c->min = div32(a->min, b->max, &r);
|
| 735 | c->openmin = (r || a->openmin || b->openmax);
|
| 736 | if (b->min > 0) {
|
| 737 | c->max = div32(a->max, b->min, &r);
|
| 738 | if (r) {
|
| 739 | c->max++;
|
| 740 | c->openmax = 1;
|
| 741 | } else
|
| 742 | c->openmax = (a->openmax || b->openmin);
|
| 743 | } else {
|
| 744 | c->max = UINT_MAX;
|
| 745 | c->openmax = 0;
|
| 746 | }
|
| 747 | c->integer = 0;
|
| 748 | }
|
| 749 |
|
| 750 | |
| 751 | * snd_interval_muldivk - refine the interval value
|
| 752 | * @a: dividend 1
|
| 753 | * @b: dividend 2
|
| 754 | * @k: divisor (as integer)
|
| 755 | * @c: result
|
| 756 | *
|
| 757 | * c = a * b / k
|
| 758 | *
|
| 759 | * Returns non-zero if the value is changed, zero if not changed.
|
| 760 |
|
| 761 | void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
|
| 762 | unsigned int k, struct snd_interval *c)
|
| 763 | {
|
| 764 | unsigned int r;
|
| 765 | if (a->empty || b->empty) {
|
| 766 | snd_interval_none(c);
|
| 767 | return;
|
| 768 | }
|
| 769 | c->empty = 0;
|
| 770 | c->min = muldiv32(a->min, b->min, k, &r);
|
| 771 | c->openmin = (r || a->openmin || b->openmin);
|
| 772 | c->max = muldiv32(a->max, b->max, k, &r);
|
| 773 | if (r) {
|
| 774 | c->max++;
|
| 775 | c->openmax = 1;
|
| 776 | } else
|
| 777 | c->openmax = (a->openmax || b->openmax);
|
| 778 | c->integer = 0;
|
| 779 | }
|
| 780 |
|
| 781 | |
| 782 | * snd_interval_mulkdiv - refine the interval value
|
| 783 | * @a: dividend 1
|
| 784 | * @k: dividend 2 (as integer)
|
| 785 | * @b: divisor
|
| 786 | * @c: result
|
| 787 | *
|
| 788 | * c = a * k / b
|
| 789 | *
|
| 790 | * Returns non-zero if the value is changed, zero if not changed.
|
| 791 |
|
| 792 | void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
|
| 793 | const struct snd_interval *b, struct snd_interval *c)
|
| 794 | {
|
| 795 | unsigned int r;
|
| 796 | if (a->empty || b->empty) {
|
| 797 | snd_interval_none(c);
|
| 798 | return;
|
| 799 | }
|
| 800 | c->empty = 0;
|
| 801 | c->min = muldiv32(a->min, k, b->max, &r);
|
| 802 | c->openmin = (r || a->openmin || b->openmax);
|
| 803 | if (b->min > 0) {
|
| 804 | c->max = muldiv32(a->max, k, b->min, &r);
|
| 805 | if (r) {
|
| 806 | c->max++;
|
| 807 | c->openmax = 1;
|
| 808 | } else
|
| 809 | c->openmax = (a->openmax || b->openmin);
|
| 810 | } else {
|
| 811 | c->max = UINT_MAX;
|
| 812 | c->openmax = 0;
|
| 813 | }
|
| 814 | c->integer = 0;
|
| 815 | }
|
| 816 |
|
| 817 |
|
| 818 |
|
| 819 |
|
| 820 | |
| 821 | * snd_interval_ratnum - refine the interval value
|
| 822 | * @i: interval to refine
|
| 823 | * @rats_count: number of ratnum_t
|
| 824 | * @rats: ratnum_t array
|
| 825 | * @nump: pointer to store the resultant numerator
|
| 826 | * @denp: pointer to store the resultant denominator
|
| 827 | *
|
| 828 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 829 | * negative error code.
|
| 830 |
|
| 831 | int snd_interval_ratnum(struct snd_interval *i,
|
| 832 | unsigned int rats_count, const struct snd_ratnum *rats,
|
| 833 | unsigned int *nump, unsigned int *denp)
|
| 834 | {
|
| 835 | unsigned int best_num, best_den;
|
| 836 | int best_diff;
|
| 837 | unsigned int k;
|
| 838 | struct snd_interval t;
|
| 839 | int err;
|
| 840 | unsigned int result_num, result_den;
|
| 841 | int result_diff;
|
| 842 |
|
| 843 | best_num = best_den = best_diff = 0;
|
| 844 | for (k = 0; k < rats_count; ++k) {
|
| 845 | unsigned int num = rats[k].num;
|
| 846 | unsigned int den;
|
| 847 | unsigned int q = i->min;
|
| 848 | int diff;
|
| 849 | if (q == 0)
|
| 850 | q = 1;
|
| 851 | den = div_up(num, q);
|
| 852 | if (den < rats[k].den_min)
|
| 853 | continue;
|
| 854 | if (den > rats[k].den_max)
|
| 855 | den = rats[k].den_max;
|
| 856 | else {
|
| 857 | unsigned int r;
|
| 858 | r = (den - rats[k].den_min) % rats[k].den_step;
|
| 859 | if (r != 0)
|
| 860 | den -= r;
|
| 861 | }
|
| 862 | diff = num - q * den;
|
| 863 | if (diff < 0)
|
| 864 | diff = -diff;
|
| 865 | if (best_num == 0 ||
|
| 866 | diff * best_den < best_diff * den) {
|
| 867 | best_diff = diff;
|
| 868 | best_den = den;
|
| 869 | best_num = num;
|
| 870 | }
|
| 871 | }
|
| 872 | if (best_den == 0) {
|
| 873 | i->empty = 1;
|
| 874 | return -EINVAL;
|
| 875 | }
|
| 876 | t.min = div_down(best_num, best_den);
|
| 877 | t.openmin = !!(best_num % best_den);
|
| 878 |
|
| 879 | result_num = best_num;
|
| 880 | result_diff = best_diff;
|
| 881 | result_den = best_den;
|
| 882 | best_num = best_den = best_diff = 0;
|
| 883 | for (k = 0; k < rats_count; ++k) {
|
| 884 | unsigned int num = rats[k].num;
|
| 885 | unsigned int den;
|
| 886 | unsigned int q = i->max;
|
| 887 | int diff;
|
| 888 | if (q == 0) {
|
| 889 | i->empty = 1;
|
| 890 | return -EINVAL;
|
| 891 | }
|
| 892 | den = div_down(num, q);
|
| 893 | if (den > rats[k].den_max)
|
| 894 | continue;
|
| 895 | if (den < rats[k].den_min)
|
| 896 | den = rats[k].den_min;
|
| 897 | else {
|
| 898 | unsigned int r;
|
| 899 | r = (den - rats[k].den_min) % rats[k].den_step;
|
| 900 | if (r != 0)
|
| 901 | den += rats[k].den_step - r;
|
| 902 | }
|
| 903 | diff = q * den - num;
|
| 904 | if (diff < 0)
|
| 905 | diff = -diff;
|
| 906 | if (best_num == 0 ||
|
| 907 | diff * best_den < best_diff * den) {
|
| 908 | best_diff = diff;
|
| 909 | best_den = den;
|
| 910 | best_num = num;
|
| 911 | }
|
| 912 | }
|
| 913 | if (best_den == 0) {
|
| 914 | i->empty = 1;
|
| 915 | return -EINVAL;
|
| 916 | }
|
| 917 | t.max = div_up(best_num, best_den);
|
| 918 | t.openmax = !!(best_num % best_den);
|
| 919 | t.integer = 0;
|
| 920 | err = snd_interval_refine(i, &t);
|
| 921 | if (err < 0)
|
| 922 | return err;
|
| 923 |
|
| 924 | if (snd_interval_single(i)) {
|
| 925 | if (best_diff * result_den < result_diff * best_den) {
|
| 926 | result_num = best_num;
|
| 927 | result_den = best_den;
|
| 928 | }
|
| 929 | if (nump)
|
| 930 | *nump = result_num;
|
| 931 | if (denp)
|
| 932 | *denp = result_den;
|
| 933 | }
|
| 934 | return err;
|
| 935 | }
|
| 936 | EXPORT_SYMBOL(snd_interval_ratnum);
|
| 937 |
|
| 938 | |
| 939 | * snd_interval_ratden - refine the interval value
|
| 940 | * @i: interval to refine
|
| 941 | * @rats_count: number of struct ratden
|
| 942 | * @rats: struct ratden array
|
| 943 | * @nump: pointer to store the resultant numerator
|
| 944 | * @denp: pointer to store the resultant denominator
|
| 945 | *
|
| 946 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 947 | * negative error code.
|
| 948 |
|
| 949 | static int snd_interval_ratden(struct snd_interval *i,
|
| 950 | unsigned int rats_count,
|
| 951 | const struct snd_ratden *rats,
|
| 952 | unsigned int *nump, unsigned int *denp)
|
| 953 | {
|
| 954 | unsigned int best_num, best_diff, best_den;
|
| 955 | unsigned int k;
|
| 956 | struct snd_interval t;
|
| 957 | int err;
|
| 958 |
|
| 959 | best_num = best_den = best_diff = 0;
|
| 960 | for (k = 0; k < rats_count; ++k) {
|
| 961 | unsigned int num;
|
| 962 | unsigned int den = rats[k].den;
|
| 963 | unsigned int q = i->min;
|
| 964 | int diff;
|
| 965 | num = mul(q, den);
|
| 966 | if (num > rats[k].num_max)
|
| 967 | continue;
|
| 968 | if (num < rats[k].num_min)
|
| 969 | num = rats[k].num_max;
|
| 970 | else {
|
| 971 | unsigned int r;
|
| 972 | r = (num - rats[k].num_min) % rats[k].num_step;
|
| 973 | if (r != 0)
|
| 974 | num += rats[k].num_step - r;
|
| 975 | }
|
| 976 | diff = num - q * den;
|
| 977 | if (best_num == 0 ||
|
| 978 | diff * best_den < best_diff * den) {
|
| 979 | best_diff = diff;
|
| 980 | best_den = den;
|
| 981 | best_num = num;
|
| 982 | }
|
| 983 | }
|
| 984 | if (best_den == 0) {
|
| 985 | i->empty = 1;
|
| 986 | return -EINVAL;
|
| 987 | }
|
| 988 | t.min = div_down(best_num, best_den);
|
| 989 | t.openmin = !!(best_num % best_den);
|
| 990 |
|
| 991 | best_num = best_den = best_diff = 0;
|
| 992 | for (k = 0; k < rats_count; ++k) {
|
| 993 | unsigned int num;
|
| 994 | unsigned int den = rats[k].den;
|
| 995 | unsigned int q = i->max;
|
| 996 | int diff;
|
| 997 | num = mul(q, den);
|
| 998 | if (num < rats[k].num_min)
|
| 999 | continue;
|
| 1000 | if (num > rats[k].num_max)
|
| 1001 | num = rats[k].num_max;
|
| 1002 | else {
|
| 1003 | unsigned int r;
|
| 1004 | r = (num - rats[k].num_min) % rats[k].num_step;
|
| 1005 | if (r != 0)
|
| 1006 | num -= r;
|
| 1007 | }
|
| 1008 | diff = q * den - num;
|
| 1009 | if (best_num == 0 ||
|
| 1010 | diff * best_den < best_diff * den) {
|
| 1011 | best_diff = diff;
|
| 1012 | best_den = den;
|
| 1013 | best_num = num;
|
| 1014 | }
|
| 1015 | }
|
| 1016 | if (best_den == 0) {
|
| 1017 | i->empty = 1;
|
| 1018 | return -EINVAL;
|
| 1019 | }
|
| 1020 | t.max = div_up(best_num, best_den);
|
| 1021 | t.openmax = !!(best_num % best_den);
|
| 1022 | t.integer = 0;
|
| 1023 | err = snd_interval_refine(i, &t);
|
| 1024 | if (err < 0)
|
| 1025 | return err;
|
| 1026 |
|
| 1027 | if (snd_interval_single(i)) {
|
| 1028 | if (nump)
|
| 1029 | *nump = best_num;
|
| 1030 | if (denp)
|
| 1031 | *denp = best_den;
|
| 1032 | }
|
| 1033 | return err;
|
| 1034 | }
|
| 1035 |
|
| 1036 | |
| 1037 | * snd_interval_list - refine the interval value from the list
|
| 1038 | * @i: the interval value to refine
|
| 1039 | * @count: the number of elements in the list
|
| 1040 | * @list: the value list
|
| 1041 | * @mask: the bit-mask to evaluate
|
| 1042 | *
|
| 1043 | * Refines the interval value from the list.
|
| 1044 | * When mask is non-zero, only the elements corresponding to bit 1 are
|
| 1045 | * evaluated.
|
| 1046 | *
|
| 1047 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 1048 | * negative error code.
|
| 1049 |
|
| 1050 | int snd_interval_list(struct snd_interval *i, unsigned int count,
|
| 1051 | const unsigned int *list, unsigned int mask)
|
| 1052 | {
|
| 1053 | unsigned int k;
|
| 1054 | struct snd_interval list_range;
|
| 1055 |
|
| 1056 | if (!count) {
|
| 1057 | i->empty = 1;
|
| 1058 | return -EINVAL;
|
| 1059 | }
|
| 1060 | snd_interval_any(&list_range);
|
| 1061 | list_range.min = UINT_MAX;
|
| 1062 | list_range.max = 0;
|
| 1063 | for (k = 0; k < count; k++) {
|
| 1064 | if (mask && !(mask & (1 << k)))
|
| 1065 | continue;
|
| 1066 | if (!snd_interval_test(i, list[k]))
|
| 1067 | continue;
|
| 1068 | list_range.min = min(list_range.min, list[k]);
|
| 1069 | list_range.max = max(list_range.max, list[k]);
|
| 1070 | }
|
| 1071 | return snd_interval_refine(i, &list_range);
|
| 1072 | }
|
| 1073 | EXPORT_SYMBOL(snd_interval_list);
|
| 1074 |
|
| 1075 | |
| 1076 | * snd_interval_ranges - refine the interval value from the list of ranges
|
| 1077 | * @i: the interval value to refine
|
| 1078 | * @count: the number of elements in the list of ranges
|
| 1079 | * @ranges: the ranges list
|
| 1080 | * @mask: the bit-mask to evaluate
|
| 1081 | *
|
| 1082 | * Refines the interval value from the list of ranges.
|
| 1083 | * When mask is non-zero, only the elements corresponding to bit 1 are
|
| 1084 | * evaluated.
|
| 1085 | *
|
| 1086 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 1087 | * negative error code.
|
| 1088 |
|
| 1089 | int snd_interval_ranges(struct snd_interval *i, unsigned int count,
|
| 1090 | const struct snd_interval *ranges, unsigned int mask)
|
| 1091 | {
|
| 1092 | unsigned int k;
|
| 1093 | struct snd_interval range_union;
|
| 1094 | struct snd_interval range;
|
| 1095 |
|
| 1096 | if (!count) {
|
| 1097 | snd_interval_none(i);
|
| 1098 | return -EINVAL;
|
| 1099 | }
|
| 1100 | snd_interval_any(&range_union);
|
| 1101 | range_union.min = UINT_MAX;
|
| 1102 | range_union.max = 0;
|
| 1103 | for (k = 0; k < count; k++) {
|
| 1104 | if (mask && !(mask & (1 << k)))
|
| 1105 | continue;
|
| 1106 | snd_interval_copy(&range, &ranges[k]);
|
| 1107 | if (snd_interval_refine(&range, i) < 0)
|
| 1108 | continue;
|
| 1109 | if (snd_interval_empty(&range))
|
| 1110 | continue;
|
| 1111 |
|
| 1112 | if (range.min < range_union.min) {
|
| 1113 | range_union.min = range.min;
|
| 1114 | range_union.openmin = 1;
|
| 1115 | }
|
| 1116 | if (range.min == range_union.min && !range.openmin)
|
| 1117 | range_union.openmin = 0;
|
| 1118 | if (range.max > range_union.max) {
|
| 1119 | range_union.max = range.max;
|
| 1120 | range_union.openmax = 1;
|
| 1121 | }
|
| 1122 | if (range.max == range_union.max && !range.openmax)
|
| 1123 | range_union.openmax = 0;
|
| 1124 | }
|
| 1125 | return snd_interval_refine(i, &range_union);
|
| 1126 | }
|
| 1127 | EXPORT_SYMBOL(snd_interval_ranges);
|
| 1128 |
|
| 1129 | static int snd_interval_step(struct snd_interval *i, unsigned int step)
|
| 1130 | {
|
| 1131 | unsigned int n;
|
| 1132 | int changed = 0;
|
| 1133 | n = i->min % step;
|
| 1134 | if (n != 0 || i->openmin) {
|
| 1135 | i->min += step - n;
|
| 1136 | i->openmin = 0;
|
| 1137 | changed = 1;
|
| 1138 | }
|
| 1139 | n = i->max % step;
|
| 1140 | if (n != 0 || i->openmax) {
|
| 1141 | i->max -= n;
|
| 1142 | i->openmax = 0;
|
| 1143 | changed = 1;
|
| 1144 | }
|
| 1145 | if (snd_interval_checkempty(i)) {
|
| 1146 | i->empty = 1;
|
| 1147 | return -EINVAL;
|
| 1148 | }
|
| 1149 | return changed;
|
| 1150 | }
|
| 1151 |
|
| 1152 |
|
| 1153 |
|
| 1154 | |
| 1155 | * snd_pcm_hw_rule_add - add the hw-constraint rule
|
| 1156 | * @runtime: the pcm runtime instance
|
| 1157 | * @cond: condition bits
|
| 1158 | * @var: the variable to evaluate
|
| 1159 | * @func: the evaluation function
|
| 1160 | * @private: the private data pointer passed to function
|
| 1161 | * @dep: the dependent variables
|
| 1162 | *
|
| 1163 | * Return: Zero if successful, or a negative error code on failure.
|
| 1164 |
|
| 1165 | int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
|
| 1166 | int var,
|
| 1167 | snd_pcm_hw_rule_func_t func, void *private,
|
| 1168 | int dep, ...)
|
| 1169 | {
|
| 1170 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
| 1171 | struct snd_pcm_hw_rule *c;
|
| 1172 | unsigned int k;
|
| 1173 | va_list args;
|
| 1174 | va_start(args, dep);
|
| 1175 | if (constrs->rules_num >= constrs->rules_all) {
|
| 1176 | struct snd_pcm_hw_rule *new;
|
| 1177 | unsigned int new_rules = constrs->rules_all + 16;
|
| 1178 | new = krealloc_array(constrs->rules, new_rules,
|
| 1179 | sizeof(*c), GFP_KERNEL);
|
| 1180 | if (!new) {
|
| 1181 | va_end(args);
|
| 1182 | return -ENOMEM;
|
| 1183 | }
|
| 1184 | constrs->rules = new;
|
| 1185 | constrs->rules_all = new_rules;
|
| 1186 | }
|
| 1187 | c = &constrs->rules[constrs->rules_num];
|
| 1188 | c->cond = cond;
|
| 1189 | c->func = func;
|
| 1190 | c->var = var;
|
| 1191 | c->private = private;
|
| 1192 | k = 0;
|
| 1193 | while (1) {
|
| 1194 | if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
|
| 1195 | va_end(args);
|
| 1196 | return -EINVAL;
|
| 1197 | }
|
| 1198 | c->deps[k++] = dep;
|
| 1199 | if (dep < 0)
|
| 1200 | break;
|
| 1201 | dep = va_arg(args, int);
|
| 1202 | }
|
| 1203 | constrs->rules_num++;
|
| 1204 | va_end(args);
|
| 1205 | return 0;
|
| 1206 | }
|
| 1207 | EXPORT_SYMBOL(snd_pcm_hw_rule_add);
|
| 1208 |
|
| 1209 | |
| 1210 | * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
|
| 1211 | * @runtime: PCM runtime instance
|
| 1212 | * @var: hw_params variable to apply the mask
|
| 1213 | * @mask: the bitmap mask
|
| 1214 | *
|
| 1215 | * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
|
| 1216 | *
|
| 1217 | * Return: Zero if successful, or a negative error code on failure.
|
| 1218 |
|
| 1219 | int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
|
| 1220 | u_int32_t mask)
|
| 1221 | {
|
| 1222 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
| 1223 | struct snd_mask *maskp = constrs_mask(constrs, var);
|
| 1224 | *maskp->bits &= mask;
|
| 1225 | memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8);
|
| 1226 | if (*maskp->bits == 0)
|
| 1227 | return -EINVAL;
|
| 1228 | return 0;
|
| 1229 | }
|
| 1230 |
|
| 1231 | |
| 1232 | * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
|
| 1233 | * @runtime: PCM runtime instance
|
| 1234 | * @var: hw_params variable to apply the mask
|
| 1235 | * @mask: the 64bit bitmap mask
|
| 1236 | *
|
| 1237 | * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
|
| 1238 | *
|
| 1239 | * Return: Zero if successful, or a negative error code on failure.
|
| 1240 |
|
| 1241 | int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
|
| 1242 | u_int64_t mask)
|
| 1243 | {
|
| 1244 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
| 1245 | struct snd_mask *maskp = constrs_mask(constrs, var);
|
| 1246 | maskp->bits[0] &= (u_int32_t)mask;
|
| 1247 | maskp->bits[1] &= (u_int32_t)(mask >> 32);
|
| 1248 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8);
|
| 1249 | if (! maskp->bits[0] && ! maskp->bits[1])
|
| 1250 | return -EINVAL;
|
| 1251 | return 0;
|
| 1252 | }
|
| 1253 | EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
|
| 1254 |
|
| 1255 | |
| 1256 | * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
|
| 1257 | * @runtime: PCM runtime instance
|
| 1258 | * @var: hw_params variable to apply the integer constraint
|
| 1259 | *
|
| 1260 | * Apply the constraint of integer to an interval parameter.
|
| 1261 | *
|
| 1262 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 1263 | * negative error code.
|
| 1264 |
|
| 1265 | int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
|
| 1266 | {
|
| 1267 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
| 1268 | return snd_interval_setinteger(constrs_interval(constrs, var));
|
| 1269 | }
|
| 1270 | EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
|
| 1271 |
|
| 1272 | |
| 1273 | * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
|
| 1274 | * @runtime: PCM runtime instance
|
| 1275 | * @var: hw_params variable to apply the range
|
| 1276 | * @min: the minimal value
|
| 1277 | * @max: the maximal value
|
| 1278 | *
|
| 1279 | * Apply the min/max range constraint to an interval parameter.
|
| 1280 | *
|
| 1281 | * Return: Positive if the value is changed, zero if it's not changed, or a
|
| 1282 | * negative error code.
|
| 1283 |
|
| 1284 | int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
|
| 1285 | unsigned int min, unsigned int max)
|
| 1286 | {
|
| 1287 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
| 1288 | struct snd_interval t;
|
| 1289 | t.min = min;
|
| 1290 | t.max = max;
|
| 1291 | t.openmin = t.openmax = 0;
|
| 1292 | t.integer = 0;
|
| 1293 | return snd_interval_refine(constrs_interval(constrs, var), &t);
|
| 1294 | }
|
| 1295 | EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
|
| 1296 |
|
| 1297 | static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
|
| 1298 | struct snd_pcm_hw_rule *rule)
|
| 1299 | {
|
| 1300 | struct snd_pcm_hw_constraint_list *list = rule->private;
|
| 1301 | return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
|
| 1302 | }
|
| 1303 |
|
| 1304 |
|
| 1305 | |
| 1306 | * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
|
| 1307 | * @runtime: PCM runtime instance
|
| 1308 | * @cond: condition bits
|
| 1309 | * @var: hw_params variable to apply the list constraint
|
| 1310 | * @l: list
|
| 1311 | *
|
| 1312 | * Apply the list of constraints to an interval parameter.
|
| 1313 | *
|
| 1314 | * Return: Zero if successful, or a negative error code on failure.
|
| 1315 |
|
| 1316 | int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
|
| 1317 | unsigned int cond,
|
| 1318 | snd_pcm_hw_param_t var,
|
| 1319 | const struct snd_pcm_hw_constraint_list *l)
|
| 1320 | {
|
| 1321 | return snd_pcm_hw_rule_add(runtime, cond, var,
|
| 1322 | snd_pcm_hw_rule_list, (void *)l,
|
| 1323 | var, -1);
|
| 1324 | }
|
| 1325 | EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
|
| 1326 |
|
| 1327 | static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
|
| 1328 | struct snd_pcm_hw_rule *rule)
|
| 1329 | {
|
| 1330 | struct snd_pcm_hw_constraint_ranges *r = rule->private;
|
| 1331 | return snd_interval_ranges(hw_param_interval(params, rule->var),
|
| 1332 | r->count, r->ranges, r->mask);
|
| 1333 | }
|
| 1334 |
|
| 1335 |
|
| 1336 | |
| 1337 | * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
|
| 1338 | * @runtime: PCM runtime instance
|
| 1339 | * @cond: condition bits
|
| 1340 | * @var: hw_params variable to apply the list of range constraints
|
| 1341 | * @r: ranges
|
| 1342 | *
|
| 1343 | * Apply the list of range constraints to an interval parameter.
|
| 1344 | *
|
| 1345 | * Return: Zero if successful, or a negative error code on failure.
|
| 1346 |
|
| 1347 | int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
|
| 1348 | unsigned int cond,
|
| 1349 | snd_pcm_hw_param_t var,
|
| 1350 | const struct snd_pcm_hw_constraint_ranges *r)
|
| 1351 | {
|
| 1352 | return snd_pcm_hw_rule_add(runtime, cond, var,
|
| 1353 | snd_pcm_hw_rule_ranges, (void *)r,
|
| 1354 | var, -1);
|
| 1355 | }
|
| 1356 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
|
| 1357 |
|
| 1358 | static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
|
| 1359 | struct snd_pcm_hw_rule *rule)
|
| 1360 | {
|
| 1361 | const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
|
| 1362 | unsigned int num = 0, den = 0;
|
| 1363 | int err;
|
| 1364 | err = snd_interval_ratnum(hw_param_interval(params, rule->var),
|
| 1365 | r->nrats, r->rats, &num, &den);
|
| 1366 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
|
| 1367 | params->rate_num = num;
|
| 1368 | params->rate_den = den;
|
| 1369 | }
|
| 1370 | return err;
|
| 1371 | }
|
| 1372 |
|
| 1373 | |
| 1374 | * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
|
| 1375 | * @runtime: PCM runtime instance
|
| 1376 | * @cond: condition bits
|
| 1377 | * @var: hw_params variable to apply the ratnums constraint
|
| 1378 | * @r: struct snd_ratnums constriants
|
| 1379 | *
|
| 1380 | * Return: Zero if successful, or a negative error code on failure.
|
| 1381 |
|
| 1382 | int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
|
| 1383 | unsigned int cond,
|
| 1384 | snd_pcm_hw_param_t var,
|
| 1385 | const struct snd_pcm_hw_constraint_ratnums *r)
|
| 1386 | {
|
| 1387 | return snd_pcm_hw_rule_add(runtime, cond, var,
|
| 1388 | snd_pcm_hw_rule_ratnums, (void *)r,
|
| 1389 | var, -1);
|
| 1390 | }
|
| 1391 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
|
| 1392 |
|
| 1393 | static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
|
| 1394 | struct snd_pcm_hw_rule *rule)
|
| 1395 | {
|
| 1396 | const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
|
| 1397 | unsigned int num = 0, den = 0;
|
| 1398 | int err = snd_interval_ratden(hw_param_interval(params, rule->var),
|
| 1399 | r->nrats, r->rats, &num, &den);
|
| 1400 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
|
| 1401 | params->rate_num = num;
|
| 1402 | params->rate_den = den;
|
| 1403 | }
|
| 1404 | return err;
|
| 1405 | }
|
| 1406 |
|
| 1407 | |
| 1408 | * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
|
| 1409 | * @runtime: PCM runtime instance
|
| 1410 | * @cond: condition bits
|
| 1411 | * @var: hw_params variable to apply the ratdens constraint
|
| 1412 | * @r: struct snd_ratdens constriants
|
| 1413 | *
|
| 1414 | * Return: Zero if successful, or a negative error code on failure.
|
| 1415 |
|
| 1416 | int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
|
| 1417 | unsigned int cond,
|
| 1418 | snd_pcm_hw_param_t var,
|
| 1419 | const struct snd_pcm_hw_constraint_ratdens *r)
|
| 1420 | {
|
| 1421 | return snd_pcm_hw_rule_add(runtime, cond, var,
|
| 1422 | snd_pcm_hw_rule_ratdens, (void *)r,
|
| 1423 | var, -1);
|
| 1424 | }
|
| 1425 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
|
| 1426 |
|
| 1427 | static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
|
| 1428 | struct snd_pcm_hw_rule *rule)
|
| 1429 | {
|
| 1430 | unsigned int l = (unsigned long) rule->private;
|
| 1431 | int width = l & 0xffff;
|
| 1432 | unsigned int msbits = l >> 16;
|
| 1433 | const struct snd_interval *i =
|
| 1434 | hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
|
| 1435 |
|
| 1436 | if (!snd_interval_single(i))
|
| 1437 | return 0;
|
| 1438 |
|
| 1439 | if ((snd_interval_value(i) == width) ||
|
| 1440 | (width == 0 && snd_interval_value(i) > msbits))
|
| 1441 | params->msbits = min_not_zero(params->msbits, msbits);
|
| 1442 |
|
| 1443 | return 0;
|
| 1444 | }
|
| 1445 |
|
| 1446 | |
| 1447 | * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
|
| 1448 | * @runtime: PCM runtime instance
|
| 1449 | * @cond: condition bits
|
| 1450 | * @width: sample bits width
|
| 1451 | * @msbits: msbits width
|
| 1452 | *
|
| 1453 | * This constraint will set the number of most significant bits (msbits) if a
|
| 1454 | * sample format with the specified width has been select. If width is set to 0
|
| 1455 | * the msbits will be set for any sample format with a width larger than the
|
| 1456 | * specified msbits.
|
| 1457 | *
|
| 1458 | * Return: Zero if successful, or a negative error code on failure.
|
| 1459 |
|
| 1460 | int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
|
| 1461 | unsigned int cond,
|
| 1462 | unsigned int width,
|
| 1463 | unsigned int msbits)
|
| 1464 | {
|
| 1465 | unsigned long l = (msbits << 16) | width;
|
| 1466 | return snd_pcm_hw_rule_add(runtime, cond, -1,
|
| 1467 | snd_pcm_hw_rule_msbits,
|
| 1468 | (void*) l,
|
| 1469 | SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
|
| 1470 | }
|
| 1471 | EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
|
| 1472 |
|
| 1473 | static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
|
| 1474 | struct snd_pcm_hw_rule *rule)
|
| 1475 | {
|
| 1476 | unsigned long step = (unsigned long) rule->private;
|
| 1477 | return snd_interval_step(hw_param_interval(params, rule->var), step);
|
| 1478 | }
|
| 1479 |
|
| 1480 | |
| 1481 | * snd_pcm_hw_constraint_step - add a hw constraint step rule
|
| 1482 | * @runtime: PCM runtime instance
|
| 1483 | * @cond: condition bits
|
| 1484 | * @var: hw_params variable to apply the step constraint
|
| 1485 | * @step: step size
|
| 1486 | *
|
| 1487 | * Return: Zero if successful, or a negative error code on failure.
|
| 1488 |
|
| 1489 | int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
|
| 1490 | unsigned int cond,
|
| 1491 | snd_pcm_hw_param_t var,
|
| 1492 | unsigned long step)
|
| 1493 | {
|
| 1494 | return snd_pcm_hw_rule_add(runtime, cond, var,
|
| 1495 | snd_pcm_hw_rule_step, (void *) step,
|
| 1496 | var, -1);
|
| 1497 | }
|
| 1498 | EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
|
| 1499 |
|
| 1500 | static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
|
| 1501 | {
|
| 1502 | static const unsigned int pow2_sizes[] = {
|
| 1503 | 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
|
| 1504 | 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
|
| 1505 | 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
|
| 1506 | 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
|
| 1507 | };
|
| 1508 | return snd_interval_list(hw_param_interval(params, rule->var),
|
| 1509 | ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
|
| 1510 | }
|
| 1511 |
|
| 1512 | |
| 1513 | * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
|
| 1514 | * @runtime: PCM runtime instance
|
| 1515 | * @cond: condition bits
|
| 1516 | * @var: hw_params variable to apply the power-of-2 constraint
|
| 1517 | *
|
| 1518 | * Return: Zero if successful, or a negative error code on failure.
|
| 1519 |
|
| 1520 | int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
|
| 1521 | unsigned int cond,
|
| 1522 | snd_pcm_hw_param_t var)
|
| 1523 | {
|
| 1524 | return snd_pcm_hw_rule_add(runtime, cond, var,
|
| 1525 | snd_pcm_hw_rule_pow2, NULL,
|
| 1526 | var, -1);
|
| 1527 | }
|
| 1528 | EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
|
| 1529 |
|
| 1530 | static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
|
| 1531 | struct snd_pcm_hw_rule *rule)
|
| 1532 | {
|
| 1533 | unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
|
| 1534 | struct snd_interval *rate;
|
| 1535 |
|
| 1536 | rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
|
| 1537 | return snd_interval_list(rate, 1, &base_rate, 0);
|
| 1538 | }
|
| 1539 |
|
| 1540 | |
| 1541 | * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
|
| 1542 | * @runtime: PCM runtime instance
|
| 1543 | * @base_rate: the rate at which the hardware does not resample
|
| 1544 | *
|
| 1545 | * Return: Zero if successful, or a negative error code on failure.
|
| 1546 |
|
| 1547 | int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
|
| 1548 | unsigned int base_rate)
|
| 1549 | {
|
| 1550 | return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
|
| 1551 | SNDRV_PCM_HW_PARAM_RATE,
|
| 1552 | snd_pcm_hw_rule_noresample_func,
|
| 1553 | (void *)(uintptr_t)base_rate,
|
| 1554 | SNDRV_PCM_HW_PARAM_RATE, -1);
|
| 1555 | }
|
| 1556 | EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
|
| 1557 |
|
| 1558 | static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
|
| 1559 | snd_pcm_hw_param_t var)
|
| 1560 | {
|
| 1561 | if (hw_is_mask(var)) {
|
| 1562 | snd_mask_any(hw_param_mask(params, var));
|
| 1563 | params->cmask |= 1 << var;
|
| 1564 | params->rmask |= 1 << var;
|
| 1565 | return;
|
| 1566 | }
|
| 1567 | if (hw_is_interval(var)) {
|
| 1568 | snd_interval_any(hw_param_interval(params, var));
|
| 1569 | params->cmask |= 1 << var;
|
| 1570 | params->rmask |= 1 << var;
|
| 1571 | return;
|
| 1572 | }
|
| 1573 | snd_BUG();
|
| 1574 | }
|
| 1575 |
|
| 1576 | void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
|
| 1577 | {
|
| 1578 | unsigned int k;
|
| 1579 | memset(params, 0, sizeof(*params));
|
| 1580 | for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
|
| 1581 | _snd_pcm_hw_param_any(params, k);
|
| 1582 | for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
|
| 1583 | _snd_pcm_hw_param_any(params, k);
|
| 1584 | params->info = ~0U;
|
| 1585 | }
|
| 1586 | EXPORT_SYMBOL(_snd_pcm_hw_params_any);
|
| 1587 |
|
| 1588 | |
| 1589 | * snd_pcm_hw_param_value - return @params field @var value
|
| 1590 | * @params: the hw_params instance
|
| 1591 | * @var: parameter to retrieve
|
| 1592 | * @dir: pointer to the direction (-1,0,1) or %NULL
|
| 1593 | *
|
| 1594 | * Return: The value for field @var if it's fixed in configuration space
|
| 1595 | * defined by @params. -%EINVAL otherwise.
|
| 1596 |
|
| 1597 | int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
|
| 1598 | snd_pcm_hw_param_t var, int *dir)
|
| 1599 | {
|
| 1600 | if (hw_is_mask(var)) {
|
| 1601 | const struct snd_mask *mask = hw_param_mask_c(params, var);
|
| 1602 | if (!snd_mask_single(mask))
|
| 1603 | return -EINVAL;
|
| 1604 | if (dir)
|
| 1605 | *dir = 0;
|
| 1606 | return snd_mask_value(mask);
|
| 1607 | }
|
| 1608 | if (hw_is_interval(var)) {
|
| 1609 | const struct snd_interval *i = hw_param_interval_c(params, var);
|
| 1610 | if (!snd_interval_single(i))
|
| 1611 | return -EINVAL;
|
| 1612 | if (dir)
|
| 1613 | *dir = i->openmin;
|
| 1614 | return snd_interval_value(i);
|
| 1615 | }
|
| 1616 | return -EINVAL;
|
| 1617 | }
|
| 1618 | EXPORT_SYMBOL(snd_pcm_hw_param_value);
|
| 1619 |
|
| 1620 | void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
|
| 1621 | snd_pcm_hw_param_t var)
|
| 1622 | {
|
| 1623 | if (hw_is_mask(var)) {
|
| 1624 | snd_mask_none(hw_param_mask(params, var));
|
| 1625 | params->cmask |= 1 << var;
|
| 1626 | params->rmask |= 1 << var;
|
| 1627 | } else if (hw_is_interval(var)) {
|
| 1628 | snd_interval_none(hw_param_interval(params, var));
|
| 1629 | params->cmask |= 1 << var;
|
| 1630 | params->rmask |= 1 << var;
|
| 1631 | } else {
|
| 1632 | snd_BUG();
|
| 1633 | }
|
| 1634 | }
|
| 1635 | EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
|
| 1636 |
|
| 1637 | static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
|
| 1638 | snd_pcm_hw_param_t var)
|
| 1639 | {
|
| 1640 | int changed;
|
| 1641 | if (hw_is_mask(var))
|
| 1642 | changed = snd_mask_refine_first(hw_param_mask(params, var));
|
| 1643 | else if (hw_is_interval(var))
|
| 1644 | changed = snd_interval_refine_first(hw_param_interval(params, var));
|
| 1645 | else
|
| 1646 | return -EINVAL;
|
| 1647 | if (changed > 0) {
|
| 1648 | params->cmask |= 1 << var;
|
| 1649 | params->rmask |= 1 << var;
|
| 1650 | }
|
| 1651 | return changed;
|
| 1652 | }
|
| 1653 |
|
| 1654 |
|
| 1655 | |
| 1656 | * snd_pcm_hw_param_first - refine config space and return minimum value
|
| 1657 | * @pcm: PCM instance
|
| 1658 | * @params: the hw_params instance
|
| 1659 | * @var: parameter to retrieve
|
| 1660 | * @dir: pointer to the direction (-1,0,1) or %NULL
|
| 1661 | *
|
| 1662 | * Inside configuration space defined by @params remove from @var all
|
| 1663 | * values > minimum. Reduce configuration space accordingly.
|
| 1664 | *
|
| 1665 | * Return: The minimum, or a negative error code on failure.
|
| 1666 |
|
| 1667 | int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
|
| 1668 | struct snd_pcm_hw_params *params,
|
| 1669 | snd_pcm_hw_param_t var, int *dir)
|
| 1670 | {
|
| 1671 | int changed = _snd_pcm_hw_param_first(params, var);
|
| 1672 | if (changed < 0)
|
| 1673 | return changed;
|
| 1674 | if (params->rmask) {
|
| 1675 | int err = snd_pcm_hw_refine(pcm, params);
|
| 1676 | if (err < 0)
|
| 1677 | return err;
|
| 1678 | }
|
| 1679 | return snd_pcm_hw_param_value(params, var, dir);
|
| 1680 | }
|
| 1681 | EXPORT_SYMBOL(snd_pcm_hw_param_first);
|
| 1682 |
|
| 1683 | static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
|
| 1684 | snd_pcm_hw_param_t var)
|
| 1685 | {
|
| 1686 | int changed;
|
| 1687 | if (hw_is_mask(var))
|
| 1688 | changed = snd_mask_refine_last(hw_param_mask(params, var));
|
| 1689 | else if (hw_is_interval(var))
|
| 1690 | changed = snd_interval_refine_last(hw_param_interval(params, var));
|
| 1691 | else
|
| 1692 | return -EINVAL;
|
| 1693 | if (changed > 0) {
|
| 1694 | params->cmask |= 1 << var;
|
| 1695 | params->rmask |= 1 << var;
|
| 1696 | }
|
| 1697 | return changed;
|
| 1698 | }
|
| 1699 |
|
| 1700 |
|
| 1701 | |
| 1702 | * snd_pcm_hw_param_last - refine config space and return maximum value
|
| 1703 | * @pcm: PCM instance
|
| 1704 | * @params: the hw_params instance
|
| 1705 | * @var: parameter to retrieve
|
| 1706 | * @dir: pointer to the direction (-1,0,1) or %NULL
|
| 1707 | *
|
| 1708 | * Inside configuration space defined by @params remove from @var all
|
| 1709 | * values < maximum. Reduce configuration space accordingly.
|
| 1710 | *
|
| 1711 | * Return: The maximum, or a negative error code on failure.
|
| 1712 |
|
| 1713 | int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
|
| 1714 | struct snd_pcm_hw_params *params,
|
| 1715 | snd_pcm_hw_param_t var, int *dir)
|
| 1716 | {
|
| 1717 | int changed = _snd_pcm_hw_param_last(params, var);
|
| 1718 | if (changed < 0)
|
| 1719 | return changed;
|
| 1720 | if (params->rmask) {
|
| 1721 | int err = snd_pcm_hw_refine(pcm, params);
|
| 1722 | if (err < 0)
|
| 1723 | return err;
|
| 1724 | }
|
| 1725 | return snd_pcm_hw_param_value(params, var, dir);
|
| 1726 | }
|
| 1727 | EXPORT_SYMBOL(snd_pcm_hw_param_last);
|
| 1728 |
|
| 1729 | |
| 1730 | * snd_pcm_hw_params_bits - Get the number of bits per the sample.
|
| 1731 | * @p: hardware parameters
|
| 1732 | *
|
| 1733 | * Return: The number of bits per sample based on the format,
|
| 1734 | * subformat and msbits the specified hw params has.
|
| 1735 |
|
| 1736 | int snd_pcm_hw_params_bits(const struct snd_pcm_hw_params *p)
|
| 1737 | {
|
| 1738 | snd_pcm_subformat_t subformat = params_subformat(p);
|
| 1739 | snd_pcm_format_t format = params_format(p);
|
| 1740 |
|
| 1741 | switch (format) {
|
| 1742 | case SNDRV_PCM_FORMAT_S32_LE:
|
| 1743 | case SNDRV_PCM_FORMAT_U32_LE:
|
| 1744 | case SNDRV_PCM_FORMAT_S32_BE:
|
| 1745 | case SNDRV_PCM_FORMAT_U32_BE:
|
| 1746 | switch (subformat) {
|
| 1747 | case SNDRV_PCM_SUBFORMAT_MSBITS_20:
|
| 1748 | return 20;
|
| 1749 | case SNDRV_PCM_SUBFORMAT_MSBITS_24:
|
| 1750 | return 24;
|
| 1751 | case SNDRV_PCM_SUBFORMAT_MSBITS_MAX:
|
| 1752 | case SNDRV_PCM_SUBFORMAT_STD:
|
| 1753 | default:
|
| 1754 | break;
|
| 1755 | }
|
| 1756 | fallthrough;
|
| 1757 | default:
|
| 1758 | return snd_pcm_format_width(format);
|
| 1759 | }
|
| 1760 | }
|
| 1761 | EXPORT_SYMBOL(snd_pcm_hw_params_bits);
|
| 1762 |
|
| 1763 | static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
|
| 1764 | void *arg)
|
| 1765 | {
|
| 1766 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 1767 |
|
| 1768 | guard(pcm_stream_lock_irqsave)(substream);
|
| 1769 | if (snd_pcm_running(substream) &&
|
| 1770 | snd_pcm_update_hw_ptr(substream) >= 0)
|
| 1771 | runtime->status->hw_ptr %= runtime->buffer_size;
|
| 1772 | else {
|
| 1773 | runtime->status->hw_ptr = 0;
|
| 1774 | runtime->hw_ptr_wrap = 0;
|
| 1775 | }
|
| 1776 | return 0;
|
| 1777 | }
|
| 1778 |
|
| 1779 | static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
|
| 1780 | void *arg)
|
| 1781 | {
|
| 1782 | struct snd_pcm_channel_info *info = arg;
|
| 1783 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 1784 | int width;
|
| 1785 | if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
|
| 1786 | info->offset = -1;
|
| 1787 | return 0;
|
| 1788 | }
|
| 1789 | width = snd_pcm_format_physical_width(runtime->format);
|
| 1790 | if (width < 0)
|
| 1791 | return width;
|
| 1792 | info->offset = 0;
|
| 1793 | switch (runtime->access) {
|
| 1794 | case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
|
| 1795 | case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
|
| 1796 | info->first = info->channel * width;
|
| 1797 | info->step = runtime->channels * width;
|
| 1798 | break;
|
| 1799 | case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
|
| 1800 | case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
|
| 1801 | {
|
| 1802 | size_t size = runtime->dma_bytes / runtime->channels;
|
| 1803 | info->first = info->channel * size * 8;
|
| 1804 | info->step = width;
|
| 1805 | break;
|
| 1806 | }
|
| 1807 | default:
|
| 1808 | snd_BUG();
|
| 1809 | break;
|
| 1810 | }
|
| 1811 | return 0;
|
| 1812 | }
|
| 1813 |
|
| 1814 | static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
|
| 1815 | void *arg)
|
| 1816 | {
|
| 1817 | struct snd_pcm_hw_params *params = arg;
|
| 1818 | snd_pcm_format_t format;
|
| 1819 | int channels;
|
| 1820 | ssize_t frame_size;
|
| 1821 |
|
| 1822 | params->fifo_size = substream->runtime->hw.fifo_size;
|
| 1823 | if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
|
| 1824 | format = params_format(params);
|
| 1825 | channels = params_channels(params);
|
| 1826 | frame_size = snd_pcm_format_size(format, channels);
|
| 1827 | if (frame_size > 0)
|
| 1828 | params->fifo_size /= frame_size;
|
| 1829 | }
|
| 1830 | return 0;
|
| 1831 | }
|
| 1832 |
|
| 1833 | static int snd_pcm_lib_ioctl_sync_id(struct snd_pcm_substream *substream,
|
| 1834 | void *arg)
|
| 1835 | {
|
| 1836 | static const unsigned char id[12] = { 0xff, 0xff, 0xff, 0xff,
|
| 1837 | 0xff, 0xff, 0xff, 0xff,
|
| 1838 | 0xff, 0xff, 0xff, 0xff };
|
| 1839 |
|
| 1840 | if (substream->runtime->std_sync_id)
|
| 1841 | snd_pcm_set_sync_per_card(substream, arg, id, sizeof(id));
|
| 1842 | return 0;
|
| 1843 | }
|
| 1844 |
|
| 1845 | |
| 1846 | * snd_pcm_lib_ioctl - a generic PCM ioctl callback
|
| 1847 | * @substream: the pcm substream instance
|
| 1848 | * @cmd: ioctl command
|
| 1849 | * @arg: ioctl argument
|
| 1850 | *
|
| 1851 | * Processes the generic ioctl commands for PCM.
|
| 1852 | * Can be passed as the ioctl callback for PCM ops.
|
| 1853 | *
|
| 1854 | * Return: Zero if successful, or a negative error code on failure.
|
| 1855 |
|
| 1856 | int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
|
| 1857 | unsigned int cmd, void *arg)
|
| 1858 | {
|
| 1859 | switch (cmd) {
|
| 1860 | case SNDRV_PCM_IOCTL1_RESET:
|
| 1861 | return snd_pcm_lib_ioctl_reset(substream, arg);
|
| 1862 | case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
|
| 1863 | return snd_pcm_lib_ioctl_channel_info(substream, arg);
|
| 1864 | case SNDRV_PCM_IOCTL1_FIFO_SIZE:
|
| 1865 | return snd_pcm_lib_ioctl_fifo_size(substream, arg);
|
| 1866 | case SNDRV_PCM_IOCTL1_SYNC_ID:
|
| 1867 | return snd_pcm_lib_ioctl_sync_id(substream, arg);
|
| 1868 | }
|
| 1869 | return -ENXIO;
|
| 1870 | }
|
| 1871 | EXPORT_SYMBOL(snd_pcm_lib_ioctl);
|
| 1872 |
|
| 1873 | |
| 1874 | * snd_pcm_period_elapsed_under_stream_lock() - update the status of runtime for the next period
|
| 1875 | * under acquired lock of PCM substream.
|
| 1876 | * @substream: the instance of pcm substream.
|
| 1877 | *
|
| 1878 | * This function is called when the batch of audio data frames as the same size as the period of
|
| 1879 | * buffer is already processed in audio data transmission.
|
| 1880 | *
|
| 1881 | * The call of function updates the status of runtime with the latest position of audio data
|
| 1882 | * transmission, checks overrun and underrun over buffer, awaken user processes from waiting for
|
| 1883 | * available audio data frames, sampling audio timestamp, and performs stop or drain the PCM
|
| 1884 | * substream according to configured threshold.
|
| 1885 | *
|
| 1886 | * The function is intended to use for the case that PCM driver operates audio data frames under
|
| 1887 | * acquired lock of PCM substream; e.g. in callback of any operation of &snd_pcm_ops in process
|
| 1888 | * context. In any interrupt context, it's preferrable to use ``snd_pcm_period_elapsed()`` instead
|
| 1889 | * since lock of PCM substream should be acquired in advance.
|
| 1890 | *
|
| 1891 | * Developer should pay enough attention that some callbacks in &snd_pcm_ops are done by the call of
|
| 1892 | * function:
|
| 1893 | *
|
| 1894 | * - .pointer - to retrieve current position of audio data transmission by frame count or XRUN state.
|
| 1895 | * - .trigger - with SNDRV_PCM_TRIGGER_STOP at XRUN or DRAINING state.
|
| 1896 | * - .get_time_info - to retrieve audio time stamp if needed.
|
| 1897 | *
|
| 1898 | * Even if more than one periods have elapsed since the last call, you have to call this only once.
|
| 1899 |
|
| 1900 | void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream)
|
| 1901 | {
|
| 1902 | struct snd_pcm_runtime *runtime;
|
| 1903 |
|
| 1904 | if (PCM_RUNTIME_CHECK(substream))
|
| 1905 | return;
|
| 1906 | runtime = substream->runtime;
|
| 1907 |
|
| 1908 | if (!snd_pcm_running(substream) ||
|
| 1909 | snd_pcm_update_hw_ptr0(substream, 1) < 0)
|
| 1910 | goto _end;
|
| 1911 |
|
| 1912 | #ifdef CONFIG_SND_PCM_TIMER
|
| 1913 | if (substream->timer_running)
|
| 1914 | snd_timer_interrupt(substream->timer, 1);
|
| 1915 | #endif
|
| 1916 | _end:
|
| 1917 | snd_kill_fasync(runtime->fasync, SIGIO, POLL_IN);
|
| 1918 | }
|
| 1919 | EXPORT_SYMBOL(snd_pcm_period_elapsed_under_stream_lock);
|
| 1920 |
|
| 1921 | |
| 1922 | * snd_pcm_period_elapsed() - update the status of runtime for the next period by acquiring lock of
|
| 1923 | * PCM substream.
|
| 1924 | * @substream: the instance of PCM substream.
|
| 1925 | *
|
| 1926 | * This function is mostly similar to ``snd_pcm_period_elapsed_under_stream_lock()`` except for
|
| 1927 | * acquiring lock of PCM substream voluntarily.
|
| 1928 | *
|
| 1929 | * It's typically called by any type of IRQ handler when hardware IRQ occurs to notify event that
|
| 1930 | * the batch of audio data frames as the same size as the period of buffer is already processed in
|
| 1931 | * audio data transmission.
|
| 1932 |
|
| 1933 | void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
|
| 1934 | {
|
| 1935 | if (snd_BUG_ON(!substream))
|
| 1936 | return;
|
| 1937 |
|
| 1938 | guard(pcm_stream_lock_irqsave)(substream);
|
| 1939 | snd_pcm_period_elapsed_under_stream_lock(substream);
|
| 1940 | }
|
| 1941 | EXPORT_SYMBOL(snd_pcm_period_elapsed);
|
| 1942 |
|
| 1943 | |
| 1944 | * Wait until avail_min data becomes available
|
| 1945 | * Returns a negative error code if any error occurs during operation.
|
| 1946 | * The available space is stored on availp. When err = 0 and avail = 0
|
| 1947 | * on the capture stream, it indicates the stream is in DRAINING state.
|
| 1948 |
|
| 1949 | static int wait_for_avail(struct snd_pcm_substream *substream,
|
| 1950 | snd_pcm_uframes_t *availp)
|
| 1951 | {
|
| 1952 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 1953 | int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
|
| 1954 | wait_queue_entry_t wait;
|
| 1955 | int err = 0;
|
| 1956 | snd_pcm_uframes_t avail = 0;
|
| 1957 | long wait_time, tout;
|
| 1958 |
|
| 1959 | init_waitqueue_entry(&wait, current);
|
| 1960 | set_current_state(TASK_INTERRUPTIBLE);
|
| 1961 | add_wait_queue(&runtime->tsleep, &wait);
|
| 1962 |
|
| 1963 | if (runtime->no_period_wakeup)
|
| 1964 | wait_time = MAX_SCHEDULE_TIMEOUT;
|
| 1965 | else {
|
| 1966 |
|
| 1967 | if (substream->wait_time) {
|
| 1968 | wait_time = substream->wait_time;
|
| 1969 | } else {
|
| 1970 | wait_time = 100;
|
| 1971 |
|
| 1972 | if (runtime->rate) {
|
| 1973 | long t = runtime->buffer_size * 1100 / runtime->rate;
|
| 1974 | wait_time = max(t, wait_time);
|
| 1975 | }
|
| 1976 | }
|
| 1977 | wait_time = msecs_to_jiffies(wait_time);
|
| 1978 | }
|
| 1979 |
|
| 1980 | for (;;) {
|
| 1981 | if (signal_pending(current)) {
|
| 1982 | err = -ERESTARTSYS;
|
| 1983 | break;
|
| 1984 | }
|
| 1985 |
|
| 1986 | |
| 1987 | * We need to check if space became available already
|
| 1988 | * (and thus the wakeup happened already) first to close
|
| 1989 | * the race of space already having become available.
|
| 1990 | * This check must happen after been added to the waitqueue
|
| 1991 | * and having current state be INTERRUPTIBLE.
|
| 1992 |
|
| 1993 | avail = snd_pcm_avail(substream);
|
| 1994 | if (avail >= runtime->twake)
|
| 1995 | break;
|
| 1996 | snd_pcm_stream_unlock_irq(substream);
|
| 1997 |
|
| 1998 | tout = schedule_timeout(wait_time);
|
| 1999 |
|
| 2000 | snd_pcm_stream_lock_irq(substream);
|
| 2001 | set_current_state(TASK_INTERRUPTIBLE);
|
| 2002 | switch (runtime->state) {
|
| 2003 | case SNDRV_PCM_STATE_SUSPENDED:
|
| 2004 | err = -ESTRPIPE;
|
| 2005 | goto _endloop;
|
| 2006 | case SNDRV_PCM_STATE_XRUN:
|
| 2007 | err = -EPIPE;
|
| 2008 | goto _endloop;
|
| 2009 | case SNDRV_PCM_STATE_DRAINING:
|
| 2010 | if (is_playback)
|
| 2011 | err = -EPIPE;
|
| 2012 | else
|
| 2013 | avail = 0;
|
| 2014 | goto _endloop;
|
| 2015 | case SNDRV_PCM_STATE_OPEN:
|
| 2016 | case SNDRV_PCM_STATE_SETUP:
|
| 2017 | case SNDRV_PCM_STATE_DISCONNECTED:
|
| 2018 | err = -EBADFD;
|
| 2019 | goto _endloop;
|
| 2020 | case SNDRV_PCM_STATE_PAUSED:
|
| 2021 | continue;
|
| 2022 | }
|
| 2023 | if (!tout) {
|
| 2024 | pcm_dbg(substream->pcm,
|
| 2025 | "%s timeout (DMA or IRQ trouble?)\n",
|
| 2026 | is_playback ? "playback write" : "capture read");
|
| 2027 | err = -EIO;
|
| 2028 | break;
|
| 2029 | }
|
| 2030 | }
|
| 2031 | _endloop:
|
| 2032 | set_current_state(TASK_RUNNING);
|
| 2033 | remove_wait_queue(&runtime->tsleep, &wait);
|
| 2034 | *availp = avail;
|
| 2035 | return err;
|
| 2036 | }
|
| 2037 |
|
| 2038 | typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
|
| 2039 | int channel, unsigned long hwoff,
|
| 2040 | struct iov_iter *iter, unsigned long bytes);
|
| 2041 |
|
| 2042 | typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
|
| 2043 | snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f,
|
| 2044 | bool);
|
| 2045 |
|
| 2046 |
|
| 2047 | static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
|
| 2048 | int channel, unsigned long hwoff)
|
| 2049 | {
|
| 2050 | return runtime->dma_area + hwoff +
|
| 2051 | channel * (runtime->dma_bytes / runtime->channels);
|
| 2052 | }
|
| 2053 |
|
| 2054 |
|
| 2055 | static int default_write_copy(struct snd_pcm_substream *substream,
|
| 2056 | int channel, unsigned long hwoff,
|
| 2057 | struct iov_iter *iter, unsigned long bytes)
|
| 2058 | {
|
| 2059 | if (copy_from_iter(get_dma_ptr(substream->runtime, channel, hwoff),
|
| 2060 | bytes, iter) != bytes)
|
| 2061 | return -EFAULT;
|
| 2062 | return 0;
|
| 2063 | }
|
| 2064 |
|
| 2065 | |
| 2066 | * from __snd_pcm_lib_write() or directly from noninterleaved_copy() when
|
| 2067 | * a NULL buffer is passed
|
| 2068 |
|
| 2069 | static int fill_silence(struct snd_pcm_substream *substream, int channel,
|
| 2070 | unsigned long hwoff, struct iov_iter *iter,
|
| 2071 | unsigned long bytes)
|
| 2072 | {
|
| 2073 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 2074 |
|
| 2075 | if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
|
| 2076 | return 0;
|
| 2077 | if (substream->ops->fill_silence)
|
| 2078 | return substream->ops->fill_silence(substream, channel,
|
| 2079 | hwoff, bytes);
|
| 2080 |
|
| 2081 | snd_pcm_format_set_silence(runtime->format,
|
| 2082 | get_dma_ptr(runtime, channel, hwoff),
|
| 2083 | bytes_to_samples(runtime, bytes));
|
| 2084 | return 0;
|
| 2085 | }
|
| 2086 |
|
| 2087 |
|
| 2088 | static int default_read_copy(struct snd_pcm_substream *substream,
|
| 2089 | int channel, unsigned long hwoff,
|
| 2090 | struct iov_iter *iter, unsigned long bytes)
|
| 2091 | {
|
| 2092 | if (copy_to_iter(get_dma_ptr(substream->runtime, channel, hwoff),
|
| 2093 | bytes, iter) != bytes)
|
| 2094 | return -EFAULT;
|
| 2095 | return 0;
|
| 2096 | }
|
| 2097 |
|
| 2098 |
|
| 2099 | static int do_transfer(struct snd_pcm_substream *substream, int c,
|
| 2100 | unsigned long hwoff, void *data, unsigned long bytes,
|
| 2101 | pcm_transfer_f transfer, bool in_kernel)
|
| 2102 | {
|
| 2103 | struct iov_iter iter;
|
| 2104 | int err, type;
|
| 2105 |
|
| 2106 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
| 2107 | type = ITER_SOURCE;
|
| 2108 | else
|
| 2109 | type = ITER_DEST;
|
| 2110 |
|
| 2111 | if (in_kernel) {
|
| 2112 | struct kvec kvec = { data, bytes };
|
| 2113 |
|
| 2114 | iov_iter_kvec(&iter, type, &kvec, 1, bytes);
|
| 2115 | return transfer(substream, c, hwoff, &iter, bytes);
|
| 2116 | }
|
| 2117 |
|
| 2118 | err = import_ubuf(type, (__force void __user *)data, bytes, &iter);
|
| 2119 | if (err)
|
| 2120 | return err;
|
| 2121 | return transfer(substream, c, hwoff, &iter, bytes);
|
| 2122 | }
|
| 2123 |
|
| 2124 | |
| 2125 | * for interleaved mode, it's one shot for all samples
|
| 2126 |
|
| 2127 | static int interleaved_copy(struct snd_pcm_substream *substream,
|
| 2128 | snd_pcm_uframes_t hwoff, void *data,
|
| 2129 | snd_pcm_uframes_t off,
|
| 2130 | snd_pcm_uframes_t frames,
|
| 2131 | pcm_transfer_f transfer,
|
| 2132 | bool in_kernel)
|
| 2133 | {
|
| 2134 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 2135 |
|
| 2136 |
|
| 2137 | hwoff = frames_to_bytes(runtime, hwoff);
|
| 2138 | off = frames_to_bytes(runtime, off);
|
| 2139 | frames = frames_to_bytes(runtime, frames);
|
| 2140 |
|
| 2141 | if (!data)
|
| 2142 | return fill_silence(substream, 0, hwoff, NULL, frames);
|
| 2143 |
|
| 2144 | return do_transfer(substream, 0, hwoff, data + off, frames, transfer,
|
| 2145 | in_kernel);
|
| 2146 | }
|
| 2147 |
|
| 2148 | |
| 2149 | * non-interleaved channel; when buffer is NULL, silencing instead of copying
|
| 2150 |
|
| 2151 | static int noninterleaved_copy(struct snd_pcm_substream *substream,
|
| 2152 | snd_pcm_uframes_t hwoff, void *data,
|
| 2153 | snd_pcm_uframes_t off,
|
| 2154 | snd_pcm_uframes_t frames,
|
| 2155 | pcm_transfer_f transfer,
|
| 2156 | bool in_kernel)
|
| 2157 | {
|
| 2158 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 2159 | int channels = runtime->channels;
|
| 2160 | void **bufs = data;
|
| 2161 | int c, err;
|
| 2162 |
|
| 2163 | |
| 2164 | * in non-interleaved mode, we copy for each channel, thus
|
| 2165 | * each copy is n_samples bytes x channels = whole frames.
|
| 2166 |
|
| 2167 | off = samples_to_bytes(runtime, off);
|
| 2168 | frames = samples_to_bytes(runtime, frames);
|
| 2169 | hwoff = samples_to_bytes(runtime, hwoff);
|
| 2170 | for (c = 0; c < channels; ++c, ++bufs) {
|
| 2171 | if (!data || !*bufs)
|
| 2172 | err = fill_silence(substream, c, hwoff, NULL, frames);
|
| 2173 | else
|
| 2174 | err = do_transfer(substream, c, hwoff, *bufs + off,
|
| 2175 | frames, transfer, in_kernel);
|
| 2176 | if (err < 0)
|
| 2177 | return err;
|
| 2178 | }
|
| 2179 | return 0;
|
| 2180 | }
|
| 2181 |
|
| 2182 | |
| 2183 | * called from snd_pcm_playback_silence()
|
| 2184 |
|
| 2185 | static int fill_silence_frames(struct snd_pcm_substream *substream,
|
| 2186 | snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
|
| 2187 | {
|
| 2188 | if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
|
| 2189 | substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
|
| 2190 | return interleaved_copy(substream, off, NULL, 0, frames,
|
| 2191 | fill_silence, true);
|
| 2192 | else
|
| 2193 | return noninterleaved_copy(substream, off, NULL, 0, frames,
|
| 2194 | fill_silence, true);
|
| 2195 | }
|
| 2196 |
|
| 2197 |
|
| 2198 | static int pcm_sanity_check(struct snd_pcm_substream *substream)
|
| 2199 | {
|
| 2200 | struct snd_pcm_runtime *runtime;
|
| 2201 | if (PCM_RUNTIME_CHECK(substream))
|
| 2202 | return -ENXIO;
|
| 2203 | runtime = substream->runtime;
|
| 2204 | if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
|
| 2205 | return -EINVAL;
|
| 2206 | if (runtime->state == SNDRV_PCM_STATE_OPEN)
|
| 2207 | return -EBADFD;
|
| 2208 | return 0;
|
| 2209 | }
|
| 2210 |
|
| 2211 | static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
|
| 2212 | {
|
| 2213 | switch (runtime->state) {
|
| 2214 | case SNDRV_PCM_STATE_PREPARED:
|
| 2215 | case SNDRV_PCM_STATE_RUNNING:
|
| 2216 | case SNDRV_PCM_STATE_PAUSED:
|
| 2217 | return 0;
|
| 2218 | case SNDRV_PCM_STATE_XRUN:
|
| 2219 | return -EPIPE;
|
| 2220 | case SNDRV_PCM_STATE_SUSPENDED:
|
| 2221 | return -ESTRPIPE;
|
| 2222 | default:
|
| 2223 | return -EBADFD;
|
| 2224 | }
|
| 2225 | }
|
| 2226 |
|
| 2227 | |
| 2228 | * when an error is returned, take back to the original value
|
| 2229 |
|
| 2230 | int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
|
| 2231 | snd_pcm_uframes_t appl_ptr)
|
| 2232 | {
|
| 2233 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 2234 | snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
|
| 2235 | snd_pcm_sframes_t diff;
|
| 2236 | int ret;
|
| 2237 |
|
| 2238 | if (old_appl_ptr == appl_ptr)
|
| 2239 | return 0;
|
| 2240 |
|
| 2241 | if (appl_ptr >= runtime->boundary)
|
| 2242 | return -EINVAL;
|
| 2243 | |
| 2244 | * check if a rewind is requested by the application
|
| 2245 |
|
| 2246 | if (substream->runtime->info & SNDRV_PCM_INFO_NO_REWINDS) {
|
| 2247 | diff = appl_ptr - old_appl_ptr;
|
| 2248 | if (diff >= 0) {
|
| 2249 | if (diff > runtime->buffer_size)
|
| 2250 | return -EINVAL;
|
| 2251 | } else {
|
| 2252 | if (runtime->boundary + diff > runtime->buffer_size)
|
| 2253 | return -EINVAL;
|
| 2254 | }
|
| 2255 | }
|
| 2256 |
|
| 2257 | runtime->control->appl_ptr = appl_ptr;
|
| 2258 | if (substream->ops->ack) {
|
| 2259 | ret = substream->ops->ack(substream);
|
| 2260 | if (ret < 0) {
|
| 2261 | runtime->control->appl_ptr = old_appl_ptr;
|
| 2262 | if (ret == -EPIPE)
|
| 2263 | __snd_pcm_xrun(substream);
|
| 2264 | return ret;
|
| 2265 | }
|
| 2266 | }
|
| 2267 |
|
| 2268 | trace_applptr(substream, old_appl_ptr, appl_ptr);
|
| 2269 |
|
| 2270 | return 0;
|
| 2271 | }
|
| 2272 |
|
| 2273 |
|
| 2274 | snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
|
| 2275 | void *data, bool interleaved,
|
| 2276 | snd_pcm_uframes_t size, bool in_kernel)
|
| 2277 | {
|
| 2278 | struct snd_pcm_runtime *runtime = substream->runtime;
|
| 2279 | snd_pcm_uframes_t xfer = 0;
|
| 2280 | snd_pcm_uframes_t offset = 0;
|
| 2281 | snd_pcm_uframes_t avail;
|
| 2282 | pcm_copy_f writer;
|
| 2283 | pcm_transfer_f transfer;
|
| 2284 | bool nonblock;
|
| 2285 | bool is_playback;
|
| 2286 | int err;
|
| 2287 |
|
| 2288 | err = pcm_sanity_check(substream);
|
| 2289 | if (err < 0)
|
| 2290 | return err;
|
| 2291 |
|
| 2292 | is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
|
| 2293 | if (interleaved) {
|
| 2294 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
|
| 2295 | runtime->channels > 1)
|
| 2296 | return -EINVAL;
|
| 2297 | writer = interleaved_copy;
|
| 2298 | } else {
|
| 2299 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
|
| 2300 | return -EINVAL;
|
| 2301 | writer = noninterleaved_copy;
|
| 2302 | }
|
| 2303 |
|
| 2304 | if (!data) {
|
| 2305 | if (is_playback)
|
| 2306 | transfer = fill_silence;
|
| 2307 | else
|
| 2308 | return -EINVAL;
|
| 2309 | } else {
|
| 2310 | if (substream->ops->copy)
|
| 2311 | transfer = substream->ops->copy;
|
| 2312 | else
|
| 2313 | transfer = is_playback ?
|
| 2314 | default_write_copy : default_read_copy;
|
| 2315 | }
|
| 2316 |
|
| 2317 | if (size == 0)
|
| 2318 | return 0;
|
| 2319 |
|
| 2320 | nonblock = !!(substream->f_flags & O_NONBLOCK);
|
| 2321 |
|
| 2322 | snd_pcm_stream_lock_irq(substream);
|
| 2323 | err = pcm_accessible_state(runtime);
|
| 2324 | if (err < 0)
|
| 2325 | goto _end_unlock;
|
| 2326 |
|
| 2327 | runtime->twake = runtime->control->avail_min ? : 1;
|
| 2328 | if (runtime->state == SNDRV_PCM_STATE_RUNNING)
|
| 2329 | snd_pcm_update_hw_ptr(substream);
|
| 2330 |
|
| 2331 | |
| 2332 | * If size < start_threshold, wait indefinitely. Another
|
| 2333 | * thread may start capture
|
| 2334 |
|
| 2335 | if (!is_playback &&
|
| 2336 | runtime->state == SNDRV_PCM_STATE_PREPARED &&
|
| 2337 | size >= runtime->start_threshold) {
|
| 2338 | err = snd_pcm_start(substream);
|
| 2339 | if (err < 0)
|
| 2340 | goto _end_unlock;
|
| 2341 | }
|
| 2342 |
|
| 2343 | avail = snd_pcm_avail(substream);
|
| 2344 |
|
| 2345 | while (size > 0) {
|
| 2346 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
|
| 2347 | snd_pcm_uframes_t cont;
|
| 2348 | if (!avail) {
|
| 2349 | if (!is_playback &&
|
| 2350 | runtime->state == SNDRV_PCM_STATE_DRAINING) {
|
| 2351 | snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
|
| 2352 | goto _end_unlock;
|
| 2353 | }
|
| 2354 | if (nonblock) {
|
| 2355 | err = -EAGAIN;
|
| 2356 | goto _end_unlock;
|
| 2357 | }
|
| 2358 | runtime->twake = min_t(snd_pcm_uframes_t, size,
|
| 2359 | runtime->control->avail_min ? : 1);
|
| 2360 | err = wait_for_avail(substream, &avail);
|
| 2361 | if (err < 0)
|
| 2362 | goto _end_unlock;
|
| 2363 | if (!avail)
|
| 2364 | continue;
|
| 2365 | }
|
| 2366 | frames = size > avail ? avail : size;
|
| 2367 | appl_ptr = READ_ONCE(runtime->control->appl_ptr);
|
| 2368 | appl_ofs = appl_ptr % runtime->buffer_size;
|
| 2369 | cont = runtime->buffer_size - appl_ofs;
|
| 2370 | if (frames > cont)
|
| 2371 | frames = cont;
|
| 2372 | if (snd_BUG_ON(!frames)) {
|
| 2373 | err = -EINVAL;
|
| 2374 | goto _end_unlock;
|
| 2375 | }
|
| 2376 | if (!atomic_inc_unless_negative(&runtime->buffer_accessing)) {
|
| 2377 | err = -EBUSY;
|
| 2378 | goto _end_unlock;
|
| 2379 | }
|
| 2380 | snd_pcm_stream_unlock_irq(substream);
|
| 2381 | if (!is_playback)
|
| 2382 | snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
|
| 2383 | err = writer(substream, appl_ofs, data, offset, frames,
|
| 2384 | transfer, in_kernel);
|
| 2385 | if (is_playback)
|
| 2386 | snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
|
| 2387 | snd_pcm_stream_lock_irq(substream);
|
| 2388 | atomic_dec(&runtime->buffer_accessing);
|
| 2389 | if (err < 0)
|
| 2390 | goto _end_unlock;
|
| 2391 | err = pcm_accessible_state(runtime);
|
| 2392 | if (err < 0)
|
| 2393 | goto _end_unlock;
|
| 2394 | appl_ptr += frames;
|
| 2395 | if (appl_ptr >= runtime->boundary)
|
| 2396 | appl_ptr -= runtime->boundary;
|
| 2397 | err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
|
| 2398 | if (err < 0)
|
| 2399 | goto _end_unlock;
|
| 2400 |
|
| 2401 | offset += frames;
|
| 2402 | size -= frames;
|
| 2403 | xfer += frames;
|
| 2404 | avail -= frames;
|
| 2405 | if (is_playback &&
|
| 2406 | runtime->state == SNDRV_PCM_STATE_PREPARED &&
|
| 2407 | snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
|
| 2408 | err = snd_pcm_start(substream);
|
| 2409 | if (err < 0)
|
| 2410 | goto _end_unlock;
|
| 2411 | }
|
| 2412 | }
|
| 2413 | _end_unlock:
|
| 2414 | runtime->twake = 0;
|
| 2415 | if (xfer > 0 && err >= 0)
|
| 2416 | snd_pcm_update_state(substream, runtime);
|
| 2417 | snd_pcm_stream_unlock_irq(substream);
|
| 2418 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
|
| 2419 | }
|
| 2420 | EXPORT_SYMBOL(__snd_pcm_lib_xfer);
|
| 2421 |
|
| 2422 | |
| 2423 | * standard channel mapping helpers
|
| 2424 |
|
| 2425 |
|
| 2426 |
|
| 2427 | const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
|
| 2428 | { .channels = 1,
|
| 2429 | .map = { SNDRV_CHMAP_MONO } },
|
| 2430 | { .channels = 2,
|
| 2431 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
|
| 2432 | { .channels = 4,
|
| 2433 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
|
| 2434 | SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
|
| 2435 | { .channels = 6,
|
| 2436 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
|
| 2437 | SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
|
| 2438 | SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
|
| 2439 | { .channels = 8,
|
| 2440 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
|
| 2441 | SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
|
| 2442 | SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
|
| 2443 | SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
|
| 2444 | { }
|
| 2445 | };
|
| 2446 | EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
|
| 2447 |
|
| 2448 |
|
| 2449 | const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
|
| 2450 | { .channels = 1,
|
| 2451 | .map = { SNDRV_CHMAP_MONO } },
|
| 2452 | { .channels = 2,
|
| 2453 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
|
| 2454 | { .channels = 4,
|
| 2455 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
|
| 2456 | SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
|
| 2457 | { .channels = 6,
|
| 2458 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
|
| 2459 | SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
|
| 2460 | SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
|
| 2461 | { .channels = 8,
|
| 2462 | .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
|
| 2463 | SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
|
| 2464 | SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
|
| 2465 | SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
|
| 2466 | { }
|
| 2467 | };
|
| 2468 | EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
|
| 2469 |
|
| 2470 | static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
|
| 2471 | {
|
| 2472 | if (ch > info->max_channels)
|
| 2473 | return false;
|
| 2474 | return !info->channel_mask || (info->channel_mask & (1U << ch));
|
| 2475 | }
|
| 2476 |
|
| 2477 | static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
|
| 2478 | struct snd_ctl_elem_info *uinfo)
|
| 2479 | {
|
| 2480 | struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
|
| 2481 |
|
| 2482 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
|
| 2483 | uinfo->count = info->max_channels;
|
| 2484 | uinfo->value.integer.min = 0;
|
| 2485 | uinfo->value.integer.max = SNDRV_CHMAP_LAST;
|
| 2486 | return 0;
|
| 2487 | }
|
| 2488 |
|
| 2489 | |
| 2490 | * stores the channel position firstly matching with the current channels
|
| 2491 |
|
| 2492 | static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
|
| 2493 | struct snd_ctl_elem_value *ucontrol)
|
| 2494 | {
|
| 2495 | struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
|
| 2496 | unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
|
| 2497 | struct snd_pcm_substream *substream;
|
| 2498 | const struct snd_pcm_chmap_elem *map;
|
| 2499 |
|
| 2500 | if (!info->chmap)
|
| 2501 | return -EINVAL;
|
| 2502 | substream = snd_pcm_chmap_substream(info, idx);
|
| 2503 | if (!substream)
|
| 2504 | return -ENODEV;
|
| 2505 | memset(ucontrol->value.integer.value, 0,
|
| 2506 | sizeof(long) * info->max_channels);
|
| 2507 | if (!substream->runtime)
|
| 2508 | return 0;
|
| 2509 | for (map = info->chmap; map->channels; map++) {
|
| 2510 | int i;
|
| 2511 | if (map->channels == substream->runtime->channels &&
|
| 2512 | valid_chmap_channels(info, map->channels)) {
|
| 2513 | for (i = 0; i < map->channels; i++)
|
| 2514 | ucontrol->value.integer.value[i] = map->map[i];
|
| 2515 | return 0;
|
| 2516 | }
|
| 2517 | }
|
| 2518 | return -EINVAL;
|
| 2519 | }
|
| 2520 |
|
| 2521 | |
| 2522 | * expands the pre-defined channel maps in a form of TLV
|
| 2523 |
|
| 2524 | static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
|
| 2525 | unsigned int size, unsigned int __user *tlv)
|
| 2526 | {
|
| 2527 | struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
|
| 2528 | const struct snd_pcm_chmap_elem *map;
|
| 2529 | unsigned int __user *dst;
|
| 2530 | int c, count = 0;
|
| 2531 |
|
| 2532 | if (!info->chmap)
|
| 2533 | return -EINVAL;
|
| 2534 | if (size < 8)
|
| 2535 | return -ENOMEM;
|
| 2536 | if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
|
| 2537 | return -EFAULT;
|
| 2538 | size -= 8;
|
| 2539 | dst = tlv + 2;
|
| 2540 | for (map = info->chmap; map->channels; map++) {
|
| 2541 | int chs_bytes = map->channels * 4;
|
| 2542 | if (!valid_chmap_channels(info, map->channels))
|
| 2543 | continue;
|
| 2544 | if (size < 8)
|
| 2545 | return -ENOMEM;
|
| 2546 | if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
|
| 2547 | put_user(chs_bytes, dst + 1))
|
| 2548 | return -EFAULT;
|
| 2549 | dst += 2;
|
| 2550 | size -= 8;
|
| 2551 | count += 8;
|
| 2552 | if (size < chs_bytes)
|
| 2553 | return -ENOMEM;
|
| 2554 | size -= chs_bytes;
|
| 2555 | count += chs_bytes;
|
| 2556 | for (c = 0; c < map->channels; c++) {
|
| 2557 | if (put_user(map->map[c], dst))
|
| 2558 | return -EFAULT;
|
| 2559 | dst++;
|
| 2560 | }
|
| 2561 | }
|
| 2562 | if (put_user(count, tlv + 1))
|
| 2563 | return -EFAULT;
|
| 2564 | return 0;
|
| 2565 | }
|
| 2566 |
|
| 2567 | static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
|
| 2568 | {
|
| 2569 | struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
|
| 2570 | info->pcm->streams[info->stream].chmap_kctl = NULL;
|
| 2571 | kfree(info);
|
| 2572 | }
|
| 2573 |
|
| 2574 | |
| 2575 | * snd_pcm_add_chmap_ctls - create channel-mapping control elements
|
| 2576 | * @pcm: the assigned PCM instance
|
| 2577 | * @stream: stream direction
|
| 2578 | * @chmap: channel map elements (for query)
|
| 2579 | * @max_channels: the max number of channels for the stream
|
| 2580 | * @private_value: the value passed to each kcontrol's private_value field
|
| 2581 | * @info_ret: store struct snd_pcm_chmap instance if non-NULL
|
| 2582 | *
|
| 2583 | * Create channel-mapping control elements assigned to the given PCM stream(s).
|
| 2584 | * Return: Zero if successful, or a negative error value.
|
| 2585 |
|
| 2586 | int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
|
| 2587 | const struct snd_pcm_chmap_elem *chmap,
|
| 2588 | int max_channels,
|
| 2589 | unsigned long private_value,
|
| 2590 | struct snd_pcm_chmap **info_ret)
|
| 2591 | {
|
| 2592 | struct snd_pcm_chmap *info;
|
| 2593 | struct snd_kcontrol_new knew = {
|
| 2594 | .iface = SNDRV_CTL_ELEM_IFACE_PCM,
|
| 2595 | .access = SNDRV_CTL_ELEM_ACCESS_READ |
|
| 2596 | SNDRV_CTL_ELEM_ACCESS_VOLATILE |
|
| 2597 | SNDRV_CTL_ELEM_ACCESS_TLV_READ |
|
| 2598 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
|
| 2599 | .info = pcm_chmap_ctl_info,
|
| 2600 | .get = pcm_chmap_ctl_get,
|
| 2601 | .tlv.c = pcm_chmap_ctl_tlv,
|
| 2602 | };
|
| 2603 | int err;
|
| 2604 |
|
| 2605 | if (WARN_ON(pcm->streams[stream].chmap_kctl))
|
| 2606 | return -EBUSY;
|
| 2607 | info = kzalloc_obj(*info);
|
| 2608 | if (!info)
|
| 2609 | return -ENOMEM;
|
| 2610 | info->pcm = pcm;
|
| 2611 | info->stream = stream;
|
| 2612 | info->chmap = chmap;
|
| 2613 | info->max_channels = max_channels;
|
| 2614 | if (stream == SNDRV_PCM_STREAM_PLAYBACK)
|
| 2615 | knew.name = "Playback Channel Map";
|
| 2616 | else
|
| 2617 | knew.name = "Capture Channel Map";
|
| 2618 | knew.device = pcm->device;
|
| 2619 | knew.count = pcm->streams[stream].substream_count;
|
| 2620 | knew.private_value = private_value;
|
| 2621 | info->kctl = snd_ctl_new1(&knew, info);
|
| 2622 | if (!info->kctl) {
|
| 2623 | kfree(info);
|
| 2624 | return -ENOMEM;
|
| 2625 | }
|
| 2626 | info->kctl->private_free = pcm_chmap_ctl_private_free;
|
| 2627 | err = snd_ctl_add(pcm->card, info->kctl);
|
| 2628 | if (err < 0)
|
| 2629 | return err;
|
| 2630 | pcm->streams[stream].chmap_kctl = info->kctl;
|
| 2631 | if (info_ret)
|
| 2632 | *info_ret = info;
|
| 2633 | return 0;
|
| 2634 | }
|
| 2635 | EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
|